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Side Pawn Capture

October 21, 2023

Side Pawn Capture
☖ pieces in hand: 歩歩
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香桂銀金王 銀桂香1
      金角 2
歩 歩歩歩歩  歩3
      飛  4
         5
 飛歩      6
歩  歩歩歩歩 歩7
 角金      8
香桂銀 玉金銀桂香9
☗ pieces in hand: 歩歩歩
Black's rook moves sideways from the second file to capture White's side pawn previously positioned on the 34 square.

In shogi, Side Pawn Capture (横歩取り yokofudori, also translated as Side Pawn Picker, Side Pawn Piker[a] or simply 横歩 yokofu Side Pawn) is a Double Static Rook opening.

The side pawns referred to are the pawns that are advanced in order to open both players' bishop diagonal. (P34 is White's side pawn, P76 is Black's.) In this opening, this pawn is captured by an opponent's rook in a gambit move – typically, made by Black with Rx34. This is one of the few gambits in shogi. The move has the typical characteristics of gambits: Black gains material with the extra pawn but now has lost tempo as their rook is now off its original file and requires a few moves to maneuver the rook back to the second file safely, White has lost material but now has faster development including the possibility of dropping a pawn to attack on the third file later (and Black has no comparable extra pawn drop possibilities).

Additionally, while White has offered the P34 gambit pawn for capture, Black has also offered their own P76 for capture as well making this a countergambit. Usually, Black accepts the side pawn gambit while White may or may not also capture Black's side pawn depending upon the variation.

Side Pawn Capture is known for having several very sharp variations.

The term Side Pawn Capture (横歩取り) can also refer to an older unrelated joseki for a Static Rook position played against Central Rook. (See: Central Rook vs Side Pawn.)

History Edit

 
Change in popularity of Static Rook openings in professional games at three points in a 34-year period (NHK Shogi Focus: April 16, 2016)
 
Openings used in 2016 (NHK Shogi Focus: April 16, 2016)

Although the Side Pawn opening was not very common decades ago, it has become one of the most popular Double Static Rook openings with professional players and was the second most common opening used in 2016 and the most popular Double Static Rook opening of that year.

The Side Pawn Capture idea is very old with records showing it was played already during the Edo period.[1] Edo-period shogi master Ryūsetsu Ōhashi is thought to be the first person to write about it. Nevertheless, in between the Meiji period and the beginning of the Shōwa period (1868–1930), capturing the pawn on 34 was considered a bad move for Black, and hence the old shogi proverb “Side pawn capture means three years of trouble.” In particular, it was thought at the time that although the capture was profitable in that a pawn was acquired, for Black it meant that the buildup of the formation would be slowed down, making it a bad idea.

Yoshio Kimura vs Yasujirō Kon 1930
☖ pieces in hand: 飛
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香桂銀金王  桂香1
 飛       2
歩 歩歩歩歩銀 歩3
      角  4
 歩       5
  歩      6
歩歩銀歩歩歩歩 歩7
  金   銀  8
香桂  玉金 桂香9
☗ pieces in hand: 角 金 歩歩
up to move 22

This would start gradually changing in the post-war years. Shogi master (and eventual Lifetime Meijin) Yoshio Kimura would challenge this prevailing view by obtaining a very high winning record playing Side Pawn Capture, and soon the strategy became popular for Black. (The adjacent diagram shows an early Side Pawn game, which Kimura won as Black, using the ☖6...P*23 variation with a bishop trade by White and Black playing an early S-77.[2]) Simultaneously, strategies for White began to be developed as well. Kunio Naitō actively adopted Side Pawn Capture (particularly the B-33 variation), and thanks to his superb command of the opening this variation is called Naitō's Aerial Fight. Other top shogi players to adopt Side Pawn Capture were Kunio Yonenaga, Makoto Nakahara, and Kōji Tanigawa. At the other extreme, other players disliked Side Pawn Capture. In the 1990 Ōshō game against then title holder Yoshikazu Minami, who did not usually capture the side pawn, challenger Yonenaga commented to the press “No way I’ll lose against a man who doesn’t capture the side pawn.” Minami responded by playing Side Pawn Capture in the game.

Exceptional developments in the Side Pawn Capture opening occurred by the end of the 1980s. With the appearance in the shogi world of top players like Yoshiharu Habu, Toshiyuki Moriuchi, and Yasumitsu Satō (often called the Habu generation), investigation into the opening and subsequent middlegame strategies rapidly developed. As a result, many variations of Side Pawn Capture for Black became established.

In 1997, Makoto Chūza first demonstrated the R-85 variation, which brought a novel interruption in Side Pawn Capture theory. Since pulling White's rook back to the fifth rank (R-85) countered the up-to-then conventional strategy, professional shogi players had a lot of trouble accommodating it due to the shogi sense they had accumulated since they were children, and for a while the winning rate for White went unusually up to almost 70%. With further research into this strategy, Tadahisa Maruyama adopted successfully Side Pawn Capture when playing White in his A-class ranking matches to become a Meijin challenger in 1999 and 2000, even using the same strategy when playing White in his Meijin match.[3]

Research has continued throughout the 21st century, and new variations have been introduced like Teruichi Aono's K-58 variation (Aono's Variation), and Yūki Sasaki's K-68 variation (Yūki's Variation).

Initial development Edit

1. P-76. Black opens their bishop diagonal. This is the most flexible first move.

This pawn that was put forward is Black's so-called side pawn (横の歩 yoko no fu). It is termed side since White's rook may capture this pawn from the eighth file (when positioned on the 86 square) by moving sideways to the seventh file (that is, R86x76).

1... P-34. White responds by opening their bishop diagonal as well.

This is White's side pawn.

The Side Pawn opening is typically started with both players attacking each other's bishop (although transpositions with later moves are possible).

2. P-26 P-84. Both players give an early indication of choosing a Static Rook opening by advancing their rook pawns. Thus, the game will likely be a Double Static Rook opening.

3. P-25 P-85. Both continue their rook pawn advances to rank 5. Thus, the likelihood of a Double Static Rook game increases.

Furthermore, this board configuration gives a strong indication of the Side Pawn opening.

4. G-78. Black moves their left gold to the seventh file protecting the 88 square from a later possible bishop attack and protecting the 87 square in preparation for White pawn exchange on that file.

4... G-32. White mirrors Black's move for the same reasons.

Both players have symmetrical positions.

This board is highly suggestive of Side Pawn Capture. However, a Double Wing Attack opening is still possible depending on whether either player actually takes the side pawn in the subsequent moves. Furthermore, a Tempo Loss Bishop Exchange opening is also possible.

5. P-24. Black initiates a pawn trade on the second file by attacking White's pawn.

5... Px24, 6. Rx24. Pawn trade clearing off the pawns on the second file and giving each player a pawn in hand.

Black's rook is positioned on 24 square. From this position, Black may capture White's side pawn on 34 in subsequent moves leading directly into the Side Pawn Capture opening.

Transpositions Edit

The Side Pawn opening position above can be reached by several different move sequences, some of which are shown below.

  Black[4] White   Black[5] White   Black[6] White   Black[7] White
1. P-26 P-84   P-26 P-84   P-76 P-84   P-76 P-34
2. P-25 P-85   P-25 P-85   P-26 G-32   P-26 G-32
3. P-76 P-34   P-76 G-32   G-78 P-34   P-25 P-84
4. G-78 G-32   G-78 P-34   P-25 P-85   G-78 P-85
5. P-24 Px24   P-24 Px24   P-24 Px24   P-24 Px24
6. Rx24   Rx24   Rx24   Rx24

The first transposition recalls the Double Wing Attack opening while the third transposition is similar to the beginning of a Bishop Exchange opening. The second transposition has similarities of both Double Wing and Bishop Exchange. The last transposition is yet another possibility.

Variation without gold development Edit

No Gold Variation
up to move 7
☖ pieces in hand: –
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香桂銀金王金銀桂香1
 飛     角 2
歩 歩歩歩歩 歩歩3
      歩歩 4
 歩       5
  歩      6
歩歩 歩歩歩歩 歩7
 角     飛 8
香桂銀金玉金銀桂香9
☗ pieces in hand: –

4. P-24. After both players advance their rook pawns to the middle rank 5, there is a variation in which Black immediately attacks on the second file without the usual left gold fortification (4. G-78) shown in the main lines above.

This may still develop into a standard Side Pawn Capture opening. However, there are other possible options which diverge from Side Pawn.

Subsequent variations Edit

At Black's pawn trade on the second file (move 11), White has two main options.[8][9] The most common option is for White to initiate a pawn trade on their rook's file. This will most likely lead to the Side Pawn Capture opening. (See § White's eighth file pawn trade below.)

The second option is for White to attack Black's rook with a pawn drop on the second file. This option can still lead to a Side Pawn Capture opening and was the older preferred option. (See following § ☖P-23.) However, White's 23 pawn drop move may also lead to a Double Wing Attack opening.

☖6...P*23 variation Edit

Main article: Side Pawn Capture Pawn*23

6...P*23. White drops their pawn in hand on the 23 square attacking Black's rook – a striking pawn tactic.

Next, Black will capture White's side pawn (7. Rx34) for this Side Pawn Capture variation. However, it is possible that Black could pull their rook back to 26 (Floating Rook) or 28 (Retreating Rook) for a Double Wing Attack variation. In the case of a Double Wing opening, Floating Rook (7. R-26) is the more common position since the rook will defend Black's side pawn on 76, which could otherwise be captured by White if R-28.

White's eighth file pawn trade variations (6...P-86 7.Px86 Rx86) Edit

6... P-86, 7. Px86 Rx86. White trades their rook pawn on the eighth file.

This is the most common move to transition to a typical Side Pawn Capture opening.

After this, both players have two pawns in the hand and their rooks are fully activated.

Side Pawn Capture
up to move 15
☖ pieces in hand: 歩歩
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香桂銀金王 銀桂香1
      金角 2
歩 歩歩歩歩  歩3
      飛  4
         5
 飛歩      6
歩  歩歩歩歩 歩7
 角金      8
香桂銀 玉金銀桂香9
☗ pieces in hand: 歩歩歩

8. Rx34. Black captures White's pawn on the third file ending up with three pawns in hand. This is the defining characteristic of Side Pawn Capture openings.

Following Black's side pawn capture, White has several options that will determine both White and Black's strategies. The most important constraint on these choices is that White must not allow Black to initiate a bishop trade with their gold on 32 undefended. One option is for White to prevent Black from initiating a bishop trade by moving a piece to the 33 square. This includes either the set of ☖ Bishop-33 strategies or a Knight-33 strategy. (See § Variations with White blocking Black's bishop trade below.) Another option is for White to initiate a bishop trade first, which leads to Double Side Pawn Capture and Bishop*45 strategies among others. (See § White's bishop trade variations below.) Another minor option is for White to move their king to the 41 square protecting the gold on 32 (See § ☖8...K-41 below).

Note that a Side Pawn Capture opening is not the only possibility here. Black may also pull their rook back to 26 or 28 for a Double Wing Attack opening with open bishop diagonals. If the rook is pulled back to 26, then the rook will prevent White from playing a reversed Side Pawn position (with Rx76) while pulling the rook back to 28 does give White this option.

Blunder: Allowing Black's bishop trade Edit

After Black captures White's side pawn, White must prevent Black from initiating a bishop trade. Otherwise, Black will make the bishop trade leading to a trap that puts White in a poor structure.

Variations with White blocking Black's bishop trade Edit

One of the major options of Side Pawn Capture is to block Black from initiating a bishop trade. Either a bishop or a knight can be used for this purpose. However, blocking with a bishop is most popular variation. These strategies are known simply as Bishop-33 and Knight-33 variations.

☖8...B-33 Edit
☖...B-33
up to move 16
☖ pieces in hand: 歩歩
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香桂銀金王 銀桂香1
      金  2
歩 歩歩歩歩角 歩3
      飛  4
         5
 飛歩      6
歩  歩歩歩歩 歩7
 角金      8
香桂銀 玉金銀桂香9
☗ pieces in hand: 歩歩歩
Main article: Side Pawn Capture Bishop-33

Using the bishop to block Black from trading bishops is the most common main variation of Side Pawn Capture.

☖8...N-33 Edit
☖...N-33
up to move 16
☖ pieces in hand: 歩歩
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香桂銀金王 銀 香1
      金角 2
歩 歩歩歩歩桂 歩3
      飛  4
         5
 飛歩      6
歩  歩歩歩歩 歩7
 角金      8
香桂銀 玉金銀桂香9
☗ pieces in hand: 歩歩歩

8...N-33.[10]

White's bishop trade variations (☖8...Bx88) Edit

8...Bx88+ 9.Sx88. Rather than preventing Black's bishop trade, White can instead initiate the bishop trade. This move allows White's silver to remain on 31 so that it still defends their gold on 32. (If Black were to make the bishop trade with Bx22+, then White's silver would be forced to recapture with Sx22 leaving the gold on 32 undefending allowing Black to capture the gold for free with Rx32+.)

Following the trade, White can initiate several different options including taking Black's side pawn (Double Side Pawn Capture), dropping their pawn on 28 and bishop on 45 (☖B*45), dropping their pawn on 38 and bishop on 44 (☖B*44), and dropping their bishop to 33 (☖Rapid Attack B*33).

Double Side Pawn (☖9...Rx76) Edit
Double Side Pawn
up to move 18
☖ pieces in hand: 角 歩歩歩
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香桂銀金王 銀桂香1
      金  2
歩 歩歩歩歩  歩3
      飛  4
         5
  飛      6
歩  歩歩歩歩 歩7
 銀金      8
香桂  玉金銀桂香9
☗ pieces in hand: 角 歩歩歩
Main article: Double Side Pawn Capture

This is White's most aggressive move leading to very dynamic play.

Double Side Pawn, Main Line
up to move 23
☖ pieces in hand: 飛 角 歩歩歩
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香桂銀金王 銀桂香1
      金  2
歩  歩歩歩  歩3
  歩      4
         5
     角   6
歩 銀歩歩歩歩 歩7
  金      8
香桂  玉金銀桂香9
☗ pieces in hand: 飛 歩歩歩
☖10...B*45 Edit
☖B*45
up to move 20
☖ pieces in hand: 歩
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香桂銀金王 銀桂香1
      金  2
歩 歩歩歩歩  歩3
      飛  4
     角   5
 飛歩      6
歩  歩歩歩歩 歩7
 銀金    銀 8
香桂  玉金 桂香9
☗ pieces in hand: 角 歩歩歩歩
Main article: Side Pawn Capture Bishop*45

The ☖Bishop*45 Side Pawn variation is one of the Side Pawn variations that starts with bishop trade initiated by White (that is, 8...Bx88+ 9.Sx88). It is named after the bishop drop position – the 45 square – that White makes three moves after the bishop trade.[11] Before the bishop drop, a pawn drop is made on the second file in order to lure Black's silver to 22 (...P*22 Sx22).

☖10...B*44 Edit

9...P*38.[12]

10. Sx38.

☖B*44
up to move 20
☖ pieces in hand: 歩
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香桂銀金王 銀桂香1
      金  2
歩 歩歩歩歩  歩3
     角飛  4
         5
 飛歩      6
歩  歩歩歩歩 歩7
 銀金   銀  8
香桂  玉金 桂香9
☗ pieces in hand: 角 歩歩歩歩

10...B*44.

☖9...B*33 Rapid Attack Edit
☖B*33
up to move 18
☖ pieces in hand: 歩歩
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香桂銀金王 銀桂香1
      金  2
歩 歩歩歩歩角 歩3
      飛  4
         5
 飛歩      6
歩  歩歩歩歩 歩7
 銀金      8
香桂  玉金銀桂香9
☗ pieces in hand: 角 歩歩歩
Main article: Side Pawn Capture Rapid Attack Bishop*33

The Rapid Attack Bishop*33 variation of Side Pawn Capture (横歩取り急戦☖３三角) has White dropping their bishop to 33 right after making the bishop trade.[12]

This is not to be confused with the more common mainline Bishop-33 variation that does not trade the bishops first. (See: Side Pawn Capture Bishop-33.)

☖8...K-41 variation Edit

☖...K-41
☖ pieces in hand: 歩歩
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香桂銀金 王銀桂香1
      金角 2
歩 歩歩歩歩  歩3
      飛  4
         5
 飛歩      6
歩  歩歩歩歩 歩7
 角金      8
香桂銀 玉金銀桂香9
☗ pieces in hand: 歩歩歩

Although the more common Side Pawn strategies prevent White's undefended gold on 32 by either stopping Black from making a bishop trade or by White making the bishop trade first, the K-41 variation moves their king to the fourth file directly protecting the gold on 32. With this positioning, White does not have to prevent Black from making the bishop trade in the first place.

The K-41 variation is an old variation played in the 1800s. However, now it is very uncommon although it was used a few times by professional players as late as 2016 and 2017.[13][14][15] The strategy is covered in Iijima's (2014) book on Rapid Attack (超急) variations of the Side Pawn.

☖8...R-82 variation Edit

☖...R-82
☖ pieces in hand: 歩歩
October 21, 2023
side, pawn, capture, pieces, hand, 歩歩987654321, 香桂銀金王, 銀桂香1, 金角, 2歩, 歩歩歩歩, 歩3, 飛歩, 6歩, 歩歩歩歩, 歩7, 角金, 8香桂銀, 玉金銀桂香9, pieces, hand, 歩歩歩, black, rook, moves, sideways, from, second, file, capture, white, side, pawn, previously, positioned, square, shogi, 横歩取り, yok. Side Pawn Capture pieces in hand 歩歩987654321 香桂銀金王 銀桂香1 金角 2歩 歩歩歩歩 歩3 飛 4 5 飛歩 6歩 歩歩歩歩 歩7 角金 8香桂銀 玉金銀桂香9 pieces in hand 歩歩歩 Black s rook moves sideways from the second file to capture White s side pawn previously positioned on the 34 square In shogi Side Pawn Capture 横歩取り yokofudori also translated as Side Pawn Picker Side Pawn Piker a or simply 横歩 yokofu Side Pawn is a Double Static Rook opening The side pawns referred to are the pawns that are advanced in order to open both players bishop diagonal P34 is White s side pawn P76 is Black s In this opening this pawn is captured by an opponent s rook in a gambit move typically made by Black with Rx34 This is one of the few gambits in shogi The move has the typical characteristics of gambits Black gains material with the extra pawn but now has lost tempo as their rook is now off its original file and requires a few moves to maneuver the rook back to the second file safely White has lost material but now has faster development including the possibility of dropping a pawn to attack on the third file later and Black has no comparable extra pawn drop possibilities Additionally while White has offered the P34 gambit pawn for capture Black has also offered their own P76 for capture as well making this a countergambit Usually Black accepts the side pawn gambit while White may or may not also capture Black s side pawn depending upon the variation Side Pawn Capture is known for having several very sharp variations The term Side Pawn Capture 横歩取り can also refer to an older unrelated joseki for a Static Rook position played against Central Rook See Central Rook vs Side Pawn Contents 1 History 2 Initial development 2 1 Transpositions 2 2 Variation without gold development 3 Subsequent variations 3 1 6 P 23 variation 3 2 White s eighth file pawn trade variations 6 P 86 7 Px86 Rx86 3 2 1 Blunder Allowing Black s bishop trade 3 2 2 Variations with White blocking Black s bishop trade 3 2 2 1 8 B 33 3 2 2 2 8 N 33 3 2 3 White s bishop trade variations 8 Bx88 3 2 3 1 Double Side Pawn 9 Rx76 3 2 3 2 10 B 45 3 2 3 3 10 B 44 3 2 3 4 9 B 33 Rapid Attack 3 2 4 8 K 41 variation 3 2 5 8 R 82 variation 3 2 6 8 K 42 variation 4 Reverse Side Pawn Capture 4 1 Game example 5 See also 6 Notes 7 References 8 Bibliography 9 External linksHistory Edit nbsp Change in popularity of Static Rook openings in professional games at three points in a 34 year period NHK Shogi Focus April 16 2016 nbsp Openings used in 2016 NHK Shogi Focus April 16 2016 Although the Side Pawn opening was not very common decades ago it has become one of the most popular Double Static Rook openings with professional players and was the second most common opening used in 2016 and the most popular Double Static Rook opening of that year The Side Pawn Capture idea is very old with records showing it was played already during the Edo period 1 Edo period shogi master Ryusetsu Ōhashi is thought to be the first person to write about it Nevertheless in between the Meiji period and the beginning of the Shōwa period 1868 1930 capturing the pawn on 34 was considered a bad move for Black and hence the old shogi proverb Side pawn capture means three years of trouble In particular it was thought at the time that although the capture was profitable in that a pawn was acquired for Black it meant that the buildup of the formation would be slowed down making it a bad idea Yoshio Kimura vs Yasujirō Kon 1930 pieces in hand 飛987654321 香桂銀金王 桂香1 飛 2歩 歩歩歩歩銀 歩3 角 4 歩 5 歩 6歩歩銀歩歩歩歩 歩7 金 銀 8香桂 玉金 桂香9 pieces in hand 角 金 歩歩 up to move 22 This would start gradually changing in the post war years Shogi master and eventual Lifetime Meijin Yoshio Kimura would challenge this prevailing view by obtaining a very high winning record playing Side Pawn Capture and soon the strategy became popular for Black The adjacent diagram shows an early Side Pawn game which Kimura won as Black using the 6 P 23 variation with a bishop trade by White and Black playing an early S 77 2 Simultaneously strategies for White began to be developed as well Kunio Naitō actively adopted Side Pawn Capture particularly the B 33 variation and thanks to his superb command of the opening this variation is called Naitō s Aerial Fight Other top shogi players to adopt Side Pawn Capture were Kunio Yonenaga Makoto Nakahara and Kōji Tanigawa At the other extreme other players disliked Side Pawn Capture In the 1990 Ōshō game against then title holder Yoshikazu Minami who did not usually capture the side pawn challenger Yonenaga commented to the press No way I ll lose against a man who doesn t capture the side pawn Minami responded by playing Side Pawn Capture in the game Exceptional developments in the Side Pawn Capture opening occurred by the end of the 1980s With the appearance in the shogi world of top players like Yoshiharu Habu Toshiyuki Moriuchi and Yasumitsu Satō often called the Habu generation investigation into the opening and subsequent middlegame strategies rapidly developed As a result many variations of Side Pawn Capture for Black became established In 1997 Makoto Chuza first demonstrated the R 85 variation which brought a novel interruption in Side Pawn Capture theory Since pulling White s rook back to the fifth rank R 85 countered the up to then conventional strategy professional shogi players had a lot of trouble accommodating it due to the shogi sense they had accumulated since they were children and for a while the winning rate for White went unusually up to almost 70 With further research into this strategy Tadahisa Maruyama adopted successfully Side Pawn Capture when playing White in his A class ranking matches to become a Meijin challenger in 1999 and 2000 even using the same strategy when playing White in his Meijin match 3 Research has continued throughout the 21st century and new variations have been introduced like Teruichi Aono s K 58 variation Aono s Variation and Yuki Sasaki s K 68 variation Yuki s Variation Initial development EditSide Pawn Capture up to move 1 pieces in hand 987654321 香桂銀金王金銀桂香1 飛 角 2歩歩歩歩歩歩歩歩歩3 4 5 歩 6歩歩 nbsp 歩歩歩歩歩歩7 角 飛 8香桂銀金玉金銀桂香9 pieces in hand Side Pawn Capture up to move 2 pieces in hand 987654321 香桂銀金王金銀桂香1 飛 角 2歩歩歩歩歩歩 nbsp 歩歩3 歩 4 5 歩 6歩歩 歩歩歩歩歩歩7 角 飛 8香桂銀金玉金銀桂香9 pieces in hand This section needs expansion You can help by adding to it May 2016 1 P 76 Black opens their bishop diagonal This is the most flexible first move This pawn that was put forward is Black s so called side pawn 横の歩 yoko no fu It is termed side since White s rook may capture this pawn from the eighth file when positioned on the 86 square by moving sideways to the seventh file that is R86x76 1 P 34 White responds by opening their bishop diagonal as well This is White s side pawn The Side Pawn opening is typically started with both players attacking each other s bishop although transpositions with later moves are possible Side Pawn Capture up to move 4 pieces in hand 987654321 香桂銀金王金銀桂香1 飛 角 2歩 nbsp 歩歩歩歩 歩歩3 歩 歩 4 5 歩 歩 6歩歩 歩歩歩歩 nbsp 歩7 角 飛 8香桂銀金玉金銀桂香9 pieces in hand Side Pawn Capture up to move 6 pieces in hand 987654321 香桂銀金王金銀桂香1 飛 角 2歩 歩歩歩歩 歩歩3 nbsp 歩 4 歩 歩 5 歩 nbsp 6歩歩 歩歩歩歩 歩7 角 飛 8香桂銀金玉金銀桂香9 pieces in hand 2 P 26 P 84 Both players give an early indication of choosing a Static Rook opening by advancing their rook pawns Thus the game will likely be a Double Static Rook opening 3 P 25 P 85 Both continue their rook pawn advances to rank 5 Thus the likelihood of a Double Static Rook game increases Furthermore this board configuration gives a strong indication of the Side Pawn opening Side Pawn Capture up to move 8 pieces in hand 987654321 香桂銀金王 nbsp 銀桂香1 飛 金角 2歩 歩歩歩歩 歩歩3 歩 4 歩 歩 5 歩 6歩歩 歩歩歩歩 歩7 角金 飛 8香桂銀 nbsp 玉金銀桂香9 pieces in hand Side Pawn Capture up to move 9 pieces in hand 987654321 香桂銀金王 銀桂香1 飛 金角 2歩 歩歩歩歩 歩歩3 歩歩 4 歩 nbsp 5 歩 6歩歩 歩歩歩歩 歩7 角金 飛 8香桂銀 玉金銀桂香9 pieces in hand 4 G 78 Black moves their left gold to the seventh file protecting the 88 square from a later possible bishop attack and protecting the 87 square in preparation for White pawn exchange on that file 4 G 32 White mirrors Black s move for the same reasons Both players have symmetrical positions This board is highly suggestive of Side Pawn Capture However a Double Wing Attack opening is still possible depending on whether either player actually takes the side pawn in the subsequent moves Furthermore a Tempo Loss Bishop Exchange opening is also possible 5 P 24 Black initiates a pawn trade on the second file by attacking White s pawn Side Pawn Capture up to move 10 pieces in hand 歩987654321 香桂銀金王 銀桂香1 飛 金角 2歩 歩歩歩歩 nbsp 歩3 歩歩 4 歩 5 歩 6歩歩 歩歩歩歩 歩7 角金 飛 8香桂銀 玉金銀桂香9 pieces in hand Side Pawn Capture up to move 11 pieces in hand 歩987654321 香桂銀金王 銀桂香1 飛 金角 2歩 歩歩歩歩 歩3 歩飛 4 歩 nbsp 5 歩 nbsp 6歩歩 歩歩歩歩 nbsp 歩7 角金 nbsp 8香桂銀 玉金銀桂香9 pieces in hand 歩 5 Px24 6 Rx24 Pawn trade clearing off the pawns on the second file and giving each player a pawn in hand Black s rook is positioned on 24 square From this position Black may capture White s side pawn on 34 in subsequent moves leading directly into the Side Pawn Capture opening Transpositions Edit The Side Pawn opening position above can be reached by several different move sequences some of which are shown below Black 4 White Black 5 White Black 6 White Black 7 White1 P 26 P 84 P 26 P 84 P 76 P 84 P 76 P 342 P 25 P 85 P 25 P 85 P 26 G 32 P 26 G 323 P 76 P 34 P 76 G 32 G 78 P 34 P 25 P 844 G 78 G 32 G 78 P 34 P 25 P 85 G 78 P 855 P 24 Px24 P 24 Px24 P 24 Px24 P 24 Px246 Rx24 Rx24 Rx24 Rx24The first transposition recalls the Double Wing Attack opening while the third transposition is similar to the beginning of a Bishop Exchange opening The second transposition has similarities of both Double Wing and Bishop Exchange The last transposition is yet another possibility Variation without gold development Edit No Gold Variation up to move 7 pieces in hand 987654321 香桂銀金王金銀桂香1 飛 角 2歩 歩歩歩歩 歩歩3 歩歩 4 歩 nbsp 5 歩 6歩歩 歩歩歩歩 歩7 角 飛 8香桂銀金玉金銀桂香9 pieces in hand This section needs expansion You can help by adding to it January 2017 4 P 24 After both players advance their rook pawns to the middle rank 5 there is a variation in which Black immediately attacks on the second file without the usual left gold fortification 4 G 78 shown in the main lines above This may still develop into a standard Side Pawn Capture opening However there are other possible options which diverge from Side Pawn Subsequent variations EditWhite s 2nd File Pawn Drop move 12 pieces in hand 987654321 香桂銀金王 銀桂香1 飛 金角 2歩 歩歩歩歩 歩歩3 歩飛 4 歩 5 歩 6歩歩 歩歩歩歩 歩7 角金 8香桂銀 玉金銀桂香9 pieces in hand 歩 6 P 23 White s 8th File Pawn Trade move 12 pieces in hand 歩987654321 香桂銀金王 銀桂香1 飛 金角 2歩 歩歩歩歩 歩3 歩飛 4 nbsp 5 歩歩 6歩歩 歩歩歩歩 歩7 角金 8香桂銀 玉金銀桂香9 pieces in hand 歩 6 P 86 At Black s pawn trade on the second file move 11 White has two main options 8 9 The most common option is for White to initiate a pawn trade on their rook s file This will most likely lead to the Side Pawn Capture opening See White s eighth file pawn trade below The second option is for White to attack Black s rook with a pawn drop on the second file This option can still lead to a Side Pawn Capture opening and was the older preferred option See following P 23 However White s 23 pawn drop move may also lead to a Double Wing Attack opening 6 P 23 variation Edit P 23 up to move 12 pieces in hand 987654321 香桂銀金王 銀桂香1 飛 金角 2歩 歩歩歩歩 歩歩3 歩飛 4 歩 5 歩 6歩歩 歩歩歩歩 歩7 角金 8香桂銀 玉金銀桂香9 pieces in hand 歩 Side pawn captured up to move 13 pieces in hand 987654321 香桂銀金王 銀桂香1 飛 金角 2歩 歩歩歩歩 歩歩3 飛 nbsp 4 歩 5 歩 6歩歩 歩歩歩歩 歩7 角金 8香桂銀 玉金銀桂香9 pieces in hand 歩歩 Main article Side Pawn Capture Pawn 23 6 P 23 White drops their pawn in hand on the 23 square attacking Black s rook a striking pawn tactic Next Black will capture White s side pawn 7 Rx34 for this Side Pawn Capture variation However it is possible that Black could pull their rook back to 26 Floating Rook or 28 Retreating Rook for a Double Wing Attack variation In the case of a Double Wing opening Floating Rook 7 R 26 is the more common position since the rook will defend Black s side pawn on 76 which could otherwise be captured by White if R 28 White s eighth file pawn trade variations 6 P 86 7 Px86 Rx86 Edit Side Pawn Capture up to move 12 pieces in hand 歩987654321 香桂銀金王 銀桂香1 飛 金角 2歩 歩歩歩歩 歩3 歩飛 4 nbsp 5 歩歩 6歩歩 歩歩歩歩 歩7 角金 8香桂銀 玉金銀桂香9 pieces in hand 歩 Side Pawn Capture up to move 14 pieces in hand 歩歩987654321 香桂銀金王 銀桂香1 nbsp 金角 2歩 nbsp 歩歩歩歩 歩3 nbsp 歩飛 4 nbsp 5 飛歩 6歩 歩歩歩歩 歩7 角金 8香桂銀 玉金銀桂香9 pieces in hand 歩歩 6 P 86 7 Px86 Rx86 White trades their rook pawn on the eighth file This is the most common move to transition to a typical Side Pawn Capture opening After this both players have two pawns in the hand and their rooks are fully activated Side Pawn Capture up to move 15 pieces in hand 歩歩987654321 香桂銀金王 銀桂香1 金角 2歩 歩歩歩歩 歩3 飛 nbsp 4 5 飛歩 6歩 歩歩歩歩 歩7 角金 8香桂銀 玉金銀桂香9 pieces in hand 歩歩歩 8 Rx34 Black captures White s pawn on the third file ending up with three pawns in hand This is the defining characteristic of Side Pawn Capture openings Following Black s side pawn capture White has several options that will determine both White and Black s strategies The most important constraint on these choices is that White must not allow Black to initiate a bishop trade with their gold on 32 undefended One option is for White to prevent Black from initiating a bishop trade by moving a piece to the 33 square This includes either the set of Bishop 33 strategies or a Knight 33 strategy See Variations with White blocking Black s bishop trade below Another option is for White to initiate a bishop trade first which leads to Double Side Pawn Capture and Bishop 45 strategies among others See White s bishop trade variations below Another minor option is for White to move their king to the 41 square protecting the gold on 32 See 8 K 41 below Note that a Side Pawn Capture opening is not the only possibility here Black may also pull their rook back to 26 or 28 for a Double Wing Attack opening with open bishop diagonals If the rook is pulled back to 26 then the rook will prevent White from playing a reversed Side Pawn position with Rx76 while pulling the rook back to 28 does give White this option Blunder Allowing Black s bishop trade Edit This section needs expansion You can help by adding to it January 2017 After Black captures White s side pawn White must prevent Black from initiating a bishop trade Otherwise Black will make the bishop trade leading to a trap that puts White in a poor structure Variations with White blocking Black s bishop trade Edit Blocking with Bishop Option move 16 pieces in hand 歩歩987654321 香桂銀金王 銀桂香1 金 nbsp 2歩 歩歩歩歩角 歩3 飛 4 5 飛歩 6歩 歩歩歩歩 歩7 角金 8香桂銀 玉金銀桂香9 pieces in hand 歩歩歩 Blocking with Knight Option move 16 pieces in hand 歩歩987654321 香桂銀金王 銀 香1 金角 2歩 歩歩歩歩桂 歩3 飛 4 5 飛歩 6歩 歩歩歩歩 歩7 角金 8香桂銀 玉金銀桂香9 pieces in hand 歩歩歩 One of the major options of Side Pawn Capture is to block Black from initiating a bishop trade Either a bishop or a knight can be used for this purpose However blocking with a bishop is most popular variation These strategies are known simply as Bishop 33 and Knight 33 variations 8 B 33 Edit B 33 up to move 16 pieces in hand 歩歩987654321 香桂銀金王 銀桂香1 金 nbsp 2歩 歩歩歩歩角 歩3 飛 4 5 飛歩 6歩 歩歩歩歩 歩7 角金 8香桂銀 玉金銀桂香9 pieces in hand 歩歩歩 Main article Side Pawn Capture Bishop 33 Using the bishop to block Black from trading bishops is the most common main variation of Side Pawn Capture 8 N 33 Edit N 33 up to move 16 pieces in hand 歩歩987654321 香桂銀金王 銀 香1 金角 2歩 歩歩歩歩桂 歩3 飛 4 5 飛歩 6歩 歩歩歩歩 歩7 角金 8香桂銀 玉金銀桂香9 pieces in hand 歩歩歩 This section needs expansion You can help by adding to it January 2017 8 N 33 10 White s bishop trade variations 8 Bx88 Edit Side Pawn Capture up to move 16 pieces in hand 角 歩歩987654321 香桂銀金王 銀桂香1 金 nbsp 2歩 歩歩歩歩 nbsp 歩3 nbsp 飛 4 nbsp 5 飛歩 nbsp 6歩 nbsp 歩歩歩歩 歩7 馬金 8香桂銀 玉金銀桂香9 pieces in hand 歩歩歩 Side Pawn Capture up to move 17 pieces in hand 角 歩歩987654321 香桂銀金王 銀桂香1 金 2歩 歩歩歩歩 歩3 飛 4 5 飛歩 6歩 歩歩歩歩 歩7 銀金 8香桂 nbsp 玉金銀桂香9 pieces in hand 角 歩歩歩 8 Bx88 9 Sx88 Rather than preventing Black s bishop trade White can instead initiate the bishop trade This move allows White s silver to remain on 31 so that it still defends their gold on 32 If Black were to make the bishop trade with Bx22 then White s silver would be forced to recapture with Sx22 leaving the gold on 32 undefending allowing Black to capture the gold for free with Rx32 Following the trade White can initiate several different options including taking Black s side pawn Double Side Pawn Capture dropping their pawn on 28 and bishop on 45 B 45 dropping their pawn on 38 and bishop on 44 B 44 and dropping their bishop to 33 Rapid Attack B 33 Side Pawn option move 18 pieces in hand 角 歩歩歩987654321 香桂銀金王 銀桂香1 金 2歩 歩歩歩歩 歩3 飛 4 5 nbsp 飛 6歩 歩歩歩歩 歩7 銀金 8香桂 玉金銀桂香9 pieces in hand 角 歩歩歩 Double Side Pawn Capture 2nd File Pawn Drop Option move 18 pieces in hand 角 歩987654321 香桂銀金王 銀桂香1 金 2歩 歩歩歩歩 歩3 飛 4 5 飛歩 6歩 歩歩歩歩 歩7 銀金 歩 8香桂 玉金銀桂香9 pieces in hand 角 歩歩歩 B 45 3rd File Pawn Drop Option move 18 pieces in hand 角 歩987654321 香桂銀金王 銀桂香1 金 2歩 歩歩歩歩 歩3 飛 4 5 飛歩 6歩 歩歩歩歩 歩7 銀金 歩 8香桂 玉金銀桂香9 pieces in hand 角 歩歩歩 B 44 3rd File Bishop Drop Option move 18 pieces in hand 歩歩987654321 香桂銀金王 銀桂香1 金 2歩 歩歩歩歩角 歩3 飛 4 5 飛歩 6歩 歩歩歩歩 歩7 銀金 8香桂 玉金銀桂香9 pieces in hand 角 歩歩歩 Rapid Attack B 33 Double Side Pawn 9 Rx76 Edit Double Side Pawn up to move 18 pieces in hand 角 歩歩歩987654321 香桂銀金王 銀桂香1 金 2歩 歩歩歩歩 歩3 飛 4 5 nbsp 飛 6歩 歩歩歩歩 歩7 銀金 8香桂 玉金銀桂香9 pieces in hand 角 歩歩歩 Main article Double Side Pawn Capture This is White s most aggressive move leading to very dynamic play Double Side Pawn Main Line up to move 23 pieces in hand 飛 角 歩歩歩987654321 香桂銀金王 銀桂香1 金 2歩 歩歩歩 歩3 歩 4 5 角 6歩 銀歩歩歩歩 歩7 金 8香桂 玉金銀桂香9 pieces in hand 飛 歩歩歩 10 B 45 Edit B 45 up to move 20 pieces in hand 歩987654321 香桂銀金王 銀桂香1 金 2歩 歩歩歩歩 歩3 飛 4 角 5 飛歩 6歩 歩歩歩歩 歩7 銀金 銀 8香桂 玉金 桂香9 pieces in hand 角 歩歩歩歩 Main article Side Pawn Capture Bishop 45 The Bishop 45 Side Pawn variation is one of the Side Pawn variations that starts with bishop trade initiated by White that is 8 Bx88 9 Sx88 It is named after the bishop drop position the 45 square that White makes three moves after the bishop trade 11 Before the bishop drop a pawn drop is made on the second file in order to lure Black s silver to 22 P 22 Sx22 10 B 44 Edit B 44 up to move 18 pieces in hand 角 歩987654321 香桂銀金王 銀桂香1 金 2歩 歩歩歩歩 歩3 飛 4 5 飛歩 6歩 歩歩歩歩 歩7 銀金 歩 8香桂 玉金銀桂香9 pieces in hand 角 歩歩歩 B 44 up to move 19 pieces in hand 角 歩987654321 香桂銀金王 銀桂香1 金 2歩 歩歩歩歩 歩3 飛 4 5 飛歩 6歩 歩歩歩歩 歩7 銀金 銀 8香桂 玉金 nbsp 桂香9 pieces in hand 角 歩歩歩歩 This section needs expansion You can help by adding to it January 2017 9 P 38 12 10 Sx38 B 44 up to move 20 pieces in hand 歩987654321 香桂銀金王 銀桂香1 金 2歩 歩歩歩歩 歩3 角飛 4 5 飛歩 6歩 歩歩歩歩 歩7 銀金 銀 8香桂 玉金 桂香9 pieces in hand 角 歩歩歩歩 10 B 44 9 B 33 Rapid Attack Edit B 33 up to move 18 pieces in hand 歩歩987654321 香桂銀金王 銀桂香1 金 2歩 歩歩歩歩角 歩3 飛 4 5 飛歩 6歩 歩歩歩歩 歩7 銀金 8香桂 玉金銀桂香9 pieces in hand 角 歩歩歩 Main article Side Pawn Capture Rapid Attack Bishop 33 The Rapid Attack Bishop 33 variation of Side Pawn Capture 横歩取り急戦 ３三角 has White dropping their bishop to 33 right after making the bishop trade 12 This is not to be confused with the more common mainline Bishop 33 variation that does not trade the bishops first See Side Pawn Capture Bishop 33 8 K 41 variation Edit K 41 pieces in hand 歩歩987654321 香桂銀金 nbsp 王銀桂香1 金角 2歩 歩歩歩歩 歩3 飛 4 5 飛歩 6歩 歩歩歩歩 歩7 角金 8香桂銀 玉金銀桂香9 pieces in hand 歩歩歩 This section needs expansion You can help by adding to it August 2017 Although the more common Side Pawn strategies prevent White s undefended gold on 32 by either stopping Black from making a bishop trade or by White making the bishop trade first the K 41 variation moves their king to the fourth file directly protecting the gold on 32 With this positioning White does not have to prevent Black from making the bishop trade in the first place The K 41 variation is an old variation played in the 1800s However now it is very uncommon although it was used a few times by professional players as late as 2016 and 2017 13 14 15 The strategy is covered in Iijima s 2014 book on Rapid Attack 超急 variations of the Side Pawn 8 R 82 variation Edit R 82 pieces in hand 歩歩987654321 香桂銀 td, wikipedia, wiki, book, books, library,

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