In shogi, Double Wing Attack or simply Wing Attack or Centre Game (相掛かり or 相懸り aigakari) is a Double Static Rookopening in which both sides directly advance their rook pawns forward on the second and eighth files toward their opponent's bishop often with the first several moves on each side being identical or very similar.
This section needs expansion. You can help by adding to it. (January 2019)
The Double Wing Attack is one of the most traditional openings dating back to over 250 years ago.
Open bishop diagonal
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Closed bishop diagonal
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Double Wing openings have two general variations. The first one has both bishop diagonals open (that is, P-76 and P-34) while the second type has bishop diagonals closed. The open bishop diagonal variations were most common historically being played from the 1700s and throughout the first part of the twentieth century.
However, in modern shogi, the term Aigakari typically refers to the closed bishop diagonal variations. One reason is that the open bishop diagonal position shown in the adjacent diagram most often develops into a Side Pawn Capture opening (where the pawn on 34 or 76 are captured by a rook) instead an open bishop diagonal variation of Double Wing. This a major change from past centuries where Side Pawn Capture openings were uncommon as they were considered to be inferior strategies. In the second half of the 20th century, Side Pawn Capture was recognized as a sound opening – eventually becoming one of the most popular Double Static Rook opening among professional players in the 21st century. Thus, a presentday Double Wing opening typically arises when the rook pawns are traded off the board first and only after this are the bishop diagonals opened (if they are opened at all), which prevents the Side Pawn Capture opening possibility. Consequently, the open bishop diagonal variations of Double Wing (without captured side pawns) are not commonly played by professional players (although they are occasionally seen).
Closed bishop diagonal variation
Double Wing Attack position after 4 moves
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1. P-26 P-84 2. P-25 P-85
Double Wing Attack position after 6 moves
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3. G-78 G-32
The initial aim of the Double Wing Attack to threaten each opponent's bishop and to exchange the rook pawns activating the rook.
From the start of the game, the pawn at the head of each bishop (23 for White, 87 for Black) is undefended. By advancing each player's rook pawn (at 83 for White, at 27 for Black), each player aims for their opponent's bishop head. Then, the initial strategy involved is to provide the head of the bishop with adequate defense and/or give the bishop an escape route from the advancing pawn.
1. P-26 P-84, 2. P-25 P-85. Following the joseki, both sides advance their rook pawns to the middle rank 5.
3. G-78 G-32. Then, golds are moved to defend each bishop's head.
An alternative option is to advance the side or edge pawn allowing the bishop to escape, which leads to a different set of josekis.
Another alternative is for Black to play a Floating Rook strategy and prevent White from making a pawn exchange, although Black's Rook becomes somewhat exposed.
Double Wing Attack position after 7 moves
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4. P-2d
Double Wing Attack position after 10 moves
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4. ...Px24 5. Rx24 P*23
4. P-24 Px24, 5. Rx24. Next, Black initiates a pawn attack on the second file leading to a pawn exchange involving the rook.
5. ...P*23. White responds by dropping a pawn to 23 to push Black's rook back.
After move 10 of Double Wing Attack, the joseki branches off into different variants depending on which square the rook moves down to. (See § Further strategy branches below.)
Protecting the bishops
After advancing the rook pawns in the first four moves (1. P-26 P-84, 2. P-25 P-85), it is important for both players to protect the bishop's head with a gold rather than immediately pushing their rook pawns again. If either player ignores protecting the bishop after move 4 (a blunder), their bishop may get trapped by a pawn drop according to the famous josekis explained below.
(A similar issue occurs in a Bishop Exchange opening where if bishop's head is not protected by a gold, then a pawn drop can occur.)
Blunder: Black's failure to defend
Black's Pawn Advance up to move 5
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1. P-26 P-84
2. P-25 P-85
3. P-24?
White's Pawn Advance up to move 8
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3. ...Px24
4. Rx24 P-86
5.P-24. This sequence of moves (1.P-26 P-84 2.P-25 P-85 3.P-24) is known as the 5-Move Bomb (五手爆弾 go-te bakudan).
If Black continues advancing their rook pawn for an attack at 23 instead of defending with a gold as recommended by joseki, after a pawn exchange on the second file involving the rook, White can start a counterattack by advancing their pawn on the eighth file.[1]
Bishop Trap up to move 10
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5. Px86 P*87!
Bishop Trap up to move 12
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6. P*23 Px88
Once Black captures White's pawn at 86, rather than recapturing Black's pawn with their rook (as happens in the recommended joseki), White can instead drop a pawn at the bishop's head (P*87). Black's bishop is now trapped.
Although Black can also attack White's bishop with a pawn drop, White now has the initiative and will capture Black's bishop first.
White's Rook-Pawn Fork up to move 14
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7. Sx88 B*33
White's Bishop Promotion up to move 16
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8. R-28 Bx57+
After Black captures White's tokin at 88 with a silver, with a bishop in hand, White can fork Black's rook and king pawn by dropping their bishop to 35. At this point, the choices for Black's rook are to either retreat or attack White's bishop. (Ignoring the bishop attack may lead to losing the rook.) If Black's rook retreats to rank 8 (as shown in the diagram), then White can promote their bishop to a horse at 57.
Bishop capture up to move 17
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9. Px23+
From here, Black can finally capture White's bishop.
Rook capturing tokin variant
This section needs expansion. You can help by adding to it. (May 2016)
After move 17, White must remove the threat of Black's tokin on 22.
Aono and Kitao recommend taking the tokin with the rook, which is defended by a silver.
(Hosking suggests a variant in which the silver captures the tokin. See below.)
From here, Black may exchange rooks.
But, White is in a better position.
Silver capturing tokin variant
Bishop Capture up to move 17
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9. Px23+
Bishop Drop up to move 19
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9. ...Sx23 10. B*45
Kitao suggests that taking the tokin with White's silver after move 17 is an inferior move.[2] The reason is because Black will drop their bishop to 45 threatening to promote at 63 and further attack White's camp.
Rook Defends up to move 20
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10. ...R-62
Rook Defends up to move 20
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11. P*52
At this point, White needs to defend 63. However, a gold can't be used for this purpose because that gold would come between the rook and the silver on rank 2 allowing Black to take the silver for free. Therefore, the suggested move is to use the rook to defend both 63 and 22.
Black now drops a pawn to put the king in check. This move tries to force White's rook to capture the pawn at 52 with White's rook (Rx52), which will allow Black to successfully promote their bishop at 63 and attack White's rook (Bx63).
Kitao considers this position uncertain compared to the position in which the rook captures the tokin.
If White uses a gold to capture the checking pawn (Gx52), then the rook's defense of the silver will be blocked allowing Black to capture the silver (Rx22).
However, Hosking has a different suggestion which Kitao does not consider.
Hosking's silver variant
Tokin recapture up to move 18
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9. ...Sx23
Bishop Drop up to move 19
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10. B*45
In contrast to Aono and Kitao, Hosking recommends the silver taking the tokin along with the defense of this silver as shown below.
If White captures the tokin with the silver, Black can now use their newly obtained bishop in the next move.
Black can drop their bishop to 45 (or 36) attacking 63.
Gold Defends up to move 20
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10. ...G-32
Bishop Promotion up to move 22
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11. Bx63+ G-52
If White tries to defend 63 with another piece now, the rook's defense of the silver on 22 will be blocked allowing Black to capture the silver on 22. Thus, Hosking's solution to defend the silver with a gold.
Black's bishop can promote, but White can attack the bishop with a gold now (since the rook is freed up from its defensive role).
Later White may capture more of Black's pawns with either their rook or horse leading to a stronger position for White.
Ignoring White's counterattack
White's Pawn Advance up to move 6
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START
White's Pawn Drop up to move 7
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4. P*23
If Black entertains the possibility of ignoring White completely and continuing their attack by dropping a pawn at 23 to attack White's bishop after move 6, the end result stills favors White.[1]
Bishop Capture up to move 10
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4. ...Px87+ 5. Px22+ Sx22
Rook Defends up to move 11
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6. R-28
Both White and Black's pawn can advance and promote, and Black captures the bishop first. White recaptures the tokin with a silver. Since White's silver at 22 is defended by their rook and Black has no more pawns to drop, Black's best move is to defend against White's attack by retreating to rank 8. Otherwise, White will capture both Black's bishop as well as Black's silver and promote their rook at the same time.
Pawn Drop up to move 12
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☗ pieces in hand: 角
6. ...P*86
With Black's rook defending 88, the number of pieces in an exchange is even: White's tokin and rook vs Black's silver and rook. However, White can now drop a dangling pawn on 86 which threatens to promote on 87 attacking Black's silver.
At this point, White will capture Black's bishop and break through their camp in future moves leaving Black in an inferior position. Black cannot save their bishop and will probably lose either their knight or silver when White's dangling pawn promotes. There is also the additional risk of White's rook promoting on the eighth file. Although Black was able to get a bishop, White has Black's bishop and also has more captured pieces.
Blunder: White's failure to defend
Double Wing Attack up to move 4
☖ pieces in hand: –
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1. P-26 P-84 2. P-25 P-85
White's Pawn Advance up to move 6
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3. G-78 P-86?
According to joseki, when both Black and White defend their bishops with a gold, after White exchanges their rook pawn, Black is recommended to drop a pawn to 8g for move 15 (see above).
However, if Black defends their bishop with gold but White does not and instead continues with a premature advance of their rook pawn, joseki recommends a different strategy.[3]
Black's Counterattack up to move 9
☖ pieces in hand: 歩
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4. Px86 Rx86 5. P-24
Bishop Trap up to move 10
☖ pieces in hand: 歩歩
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5. ...Px24
After White attacks 87 and the subsequent pawn exchange, joseki recommends that Black start a counterattack at the head of White's bishop (23) by the rook pawn rather than trying to defensively attack White's rook. (The reason for this is that White's rook could simply fall back to a floating rook position on 84 thus preventing Black from making a pawn exchange on the second file and then controlling the flow of the game.)
After Black's counterattack, White will capture Black's pawn.
Bishop Trap up to move 11
☖ pieces in hand: 歩歩
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6. P*23!
Bishop Trap up to move 13
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6. ...P*87 7. Px22+
This pawn capture by White allows Black to drop a pawn (obtained from the eighth file pawn exchange) at the head of White's bishop.
White can follow suit and also drop a pawn at the head of Black's bishop.
But, Black captures White's bishop first.
Bishop Trap up to move 14
☖ pieces in hand: 歩歩
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7. ...Sx22
Rook–Pawn Fork up to move 15
☖ pieces in hand: 歩歩
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8. B*75
After White recaptures Black's tokin on the second file, Black drops the bishop on 75 creating a rook–pawn fork.
(Although it's possible that Black could also protect their bishop by capturing White's pawn with their gold [8. Gx77], this is a bad move since White's rook will be able to promote after taking Black's gold [8. ...Rx77+].)
White now has a choice between retreating their rook back to their camp at 82 or attacking Black's bishop.
Bishop Promotion up to move 17
☖ pieces in hand: 歩歩
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8. ...R-85 9. Bx53+
Bishop Sidestep up to move 19
☖ pieces in hand: 歩歩
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9. ...R-55+ 10. +Bx43
If the bishop on 75 is attacked (as shown here, R-85), then Black will promote their bishop on fifth file.
White's rook can continue to attack the bishop (R-55), but Black can continue eluding capture with a sidestep to the fourth file.
Black Gains Knight up to move 23
☖ pieces in hand: 歩歩歩歩
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☗ pieces in hand: 桂歩
10. ...+Rx57
11. P*58 +Rx47
12. +Bx21
White's rook can now promote (R-57+), but Black can defend their king with a pawn drop (P*58).
White can capture another pawn (+Rx47), but Black can gain a knight (+Bx21).
This position is thought to still favor Black.
Blunder: Inferiority of silver
Silver Defense position after 6 moves
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3. S-78?
Silver Defense position after 7 moves
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March 09, 2023
double, wing, attack, position, pieces, hand, 987654321, 香桂銀金王, 銀桂香1, 金角, 2歩, 歩歩歩歩歩歩歩3, 6歩歩歩歩歩歩歩, 歩7, 角金, 8香桂銀, 玉金銀桂香9, pieces, hand, shogi, simply, wing, attack, centre, game, 相掛かり, 相懸り, aigakari, double, static, rook, opening, which, both, sides, directly, a. Double Wing Attack position pieces in hand 987654321 香桂銀金王 銀桂香1 飛 金角 2歩 歩歩歩歩歩歩歩3 4 歩 歩 5 6歩歩歩歩歩歩歩 歩7 角金 飛 8香桂銀 玉金銀桂香9 pieces in hand In shogi Double Wing Attack or simply Wing Attack or Centre Game 相掛かり or 相懸り aigakari is a Double Static Rook opening in which both sides directly advance their rook pawns forward on the second and eighth files toward their opponent s bishop often with the first several moves on each side being identical or very similar Contents 1 History and general discussion 2 Closed bishop diagonal variation 2 1 Protecting the bishops 2 1 1 Blunder Black s failure to defend 2 1 1 1 Rook capturing tokin variant 2 1 1 2 Silver capturing tokin variant 2 1 1 2 1 Hosking s silver variant 2 1 1 3 Ignoring White s counterattack 2 1 2 Blunder White s failure to defend 2 1 3 Blunder Inferiority of silver 2 2 Further strategy branches 2 2 1 Retreating Rook 2 2 2 Floating Rook 2 2 3 Old Double Wing opening 3 Open bishop diagonal variation 4 See also 5 References 6 Bibliography 7 External linksHistory and general discussion EditThis section needs expansion You can help by adding to it January 2019 The Double Wing Attack is one of the most traditional openings dating back to over 250 years ago Open bishop diagonal 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 4 歩 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 Closed bishop diagonal pieces in hand 987654321 香桂銀金王 銀桂香1 飛 金角 2歩 歩歩歩歩歩歩歩3 4 歩 歩 5 6歩歩歩歩歩歩歩 歩7 角金 飛 8香桂銀 玉金銀桂香9 pieces in hand Double Wing openings have two general variations The first one has both bishop diagonals open that is P 76 and P 34 while the second type has bishop diagonals closed The open bishop diagonal variations were most common historically being played from the 1700s and throughout the first part of the twentieth century However in modern shogi the term Aigakari typically refers to the closed bishop diagonal variations One reason is that the open bishop diagonal position shown in the adjacent diagram most often develops into a Side Pawn Capture opening where the pawn on 34 or 76 are captured by a rook instead an open bishop diagonal variation of Double Wing This a major change from past centuries where Side Pawn Capture openings were uncommon as they were considered to be inferior strategies In the second half of the 20th century Side Pawn Capture was recognized as a sound opening eventually becoming one of the most popular Double Static Rook opening among professional players in the 21st century Thus a presentday Double Wing opening typically arises when the rook pawns are traded off the board first and only after this are the bishop diagonals opened if they are opened at all which prevents the Side Pawn Capture opening possibility Consequently the open bishop diagonal variations of Double Wing without captured side pawns are not commonly played by professional players although they are occasionally seen Closed bishop diagonal variation EditDouble Wing Attackposition after 4 moves 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3 4 歩 歩 5 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 1 P 26 P 84 2 P 25 P 85 Double Wing Attackposition after 6 moves pieces in hand 987654321 香桂銀金王 銀桂香1 飛 金角 2歩 歩歩歩歩歩歩歩3 4 歩 歩 5 6歩歩歩歩歩歩歩 歩7 角金 飛 8香桂銀 玉金銀桂香9 pieces in hand 3 G 78 G 32 The initial aim of the Double Wing Attack to threaten each opponent s bishop and to exchange the rook pawns activating the rook From the start of the game the pawn at the head of each bishop 23 for White 87 for Black is undefended By advancing each player s rook pawn at 83 for White at 27 for Black each player aims for their opponent s bishop head Then the initial strategy involved is to provide the head of the bishop with adequate defense and or give the bishop an escape route from the advancing pawn 1 P 26 P 84 2 P 25 P 85 Following the joseki both sides advance their rook pawns to the middle rank 5 3 G 78 G 32 Then golds are moved to defend each bishop s head Note that the head of the bishop should be defended See Protecting the bishops below An alternative option is to advance the side or edge pawn allowing the bishop to escape which leads to a different set of josekis Another alternative is for Black to play a Floating Rook strategy and prevent White from making a pawn exchange although Black s Rook becomes somewhat exposed Double Wing Attackposition after 7 moves pieces in hand 987654321 香桂銀金王 銀桂香1 飛 金角 2歩 歩歩歩歩歩歩歩3 歩 4 歩 5 6歩歩歩歩歩歩歩 歩7 角金 飛 8香桂銀 玉金銀桂香9 pieces in hand 4 P 2d Double Wing Attackposition after 10 moves pieces in hand 987654321 香桂銀金王 銀桂香1 飛 金角 2歩 歩歩歩歩歩歩歩3 飛 4 歩 5 6歩歩歩歩歩歩歩 歩7 角金 8香桂銀 玉金銀桂香9 pieces in hand 歩 4 Px24 5 Rx24 P 23 4 P 24 Px24 5 Rx24 Next Black initiates a pawn attack on the second file leading to a pawn exchange involving the rook 5 P 23 White responds by dropping a pawn to 23 to push Black s rook back After move 10 of Double Wing Attack the joseki branches off into different variants depending on which square the rook moves down to See Further strategy branches below Protecting the bishops Edit After advancing the rook pawns in the first four moves 1 P 26 P 84 2 P 25 P 85 it is important for both players to protect the bishop s head with a gold rather than immediately pushing their rook pawns again If either player ignores protecting the bishop after move 4 a blunder their bishop may get trapped by a pawn drop according to the famous josekis explained below A similar issue occurs in a Bishop Exchange opening where if bishop s head is not protected by a gold then a pawn drop can occur Blunder Black s failure to defend Edit Black s Pawn Advanceup to move 5 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3 歩 4 歩 5 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 1 P 26 P 842 P 25 P 85 3 P 24 White s Pawn Advanceup to move 8 pieces in hand 歩987654321 香桂銀金王金銀桂香1 飛 角 2歩 歩歩歩歩歩 歩3 飛 4 5 歩 6歩歩歩歩歩歩歩 歩7 角 8香桂銀金玉金銀桂香9 pieces in hand 歩 3 Px244 Rx24 P 86 5 P 24 This sequence of moves 1 P 26 P 84 2 P 25 P 85 3 P 24 is known as the 5 Move Bomb 五手爆弾 go te bakudan If Black continues advancing their rook pawn for an attack at 23 instead of defending with a gold as recommended by joseki after a pawn exchange on the second file involving the rook White can start a counterattack by advancing their pawn on the eighth file 1 Bishop Trapup to move 10 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 飛 4 5 歩 6歩歩歩歩歩歩歩 歩7 角 8香桂銀金玉金銀桂香9 pieces in hand 歩歩 5 Px86 P 87 Bishop Trapup to move 12 pieces in hand 角987654321 香桂銀金王金銀桂香1 飛 角 2歩 歩歩歩歩歩歩歩3 飛 4 5 歩 6歩 歩歩歩歩歩 歩7 と 8香桂銀金玉金銀桂香9 pieces in hand 歩 6 P 23 Px88 Once Black captures White s pawn at 86 rather than recapturing Black s pawn with their rook as happens in the recommended joseki White can instead drop a pawn at the bishop s head P 87 Black s bishop is now trapped Although Black can also attack White s bishop with a pawn drop White now has the initiative and will capture Black s bishop first White s Rook Pawn Forkup to move 14 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3 飛 4 角 5 歩 6歩 歩歩歩歩歩 歩7 銀 8香桂 金玉金銀桂香9 pieces in hand 歩歩 7 Sx88 B 33 White s Bishop Promotionup to move 16 pieces in hand 歩987654321 香桂銀金王金銀桂香1 飛 角 2歩 歩歩歩歩歩歩歩3 4 5 歩 6歩 歩歩馬歩歩 歩7 銀 飛 8香桂 金玉金銀桂香9 pieces in hand 歩歩 8 R 28 Bx57 After Black captures White s tokin at 88 with a silver with a bishop in hand White can fork Black s rook and king pawn by dropping their bishop to 35 At this point the choices for Black s rook are to either retreat or attack White s bishop Ignoring the bishop attack may lead to losing the rook If Black s rook retreats to rank 8 as shown in the diagram then White can promote their bishop to a horse at 57 Bishop captureup to move 17 pieces in hand 歩987654321 香桂銀金王金銀桂香1 飛 と 2歩 歩歩歩歩歩 歩3 4 5 歩 6歩 歩歩馬歩歩 歩7 銀 飛 8香桂 金玉金銀桂香9 pieces in hand 角 歩歩 9 Px23 From here Black can finally capture White s bishop Rook capturing tokin variant Edit This section needs expansion You can help by adding to it May 2016 After move 17 White must remove the threat of Black s tokin on 22 Aono and Kitao recommend taking the tokin with the rook which is defended by a silver Hosking suggests a variant in which the silver captures the tokin See below From here Black may exchange rooks But White is in a better position Silver capturing tokin variant Edit Bishop Captureup to move 17 pieces in hand 歩987654321 香桂銀金王金銀桂香1 飛 と 2歩 歩歩歩歩歩 歩3 4 5 歩 6歩 歩歩馬歩歩 歩7 銀 飛 8香桂 金玉金銀桂香9 pieces in hand 角 歩歩 9 Px23 Bishop Dropup to move 19 pieces in hand 歩歩987654321 香桂銀金王金 桂香1 飛 銀 2歩 歩歩歩歩歩 歩3 4 角 5 歩 6歩 歩歩馬歩歩 歩7 銀 飛 8香桂 金玉金銀桂香9 pieces in hand 歩歩 9 Sx23 10 B 45 Kitao suggests that taking the tokin with White s silver after move 17 is an inferior move 2 The reason is because Black will drop their bishop to 45 threatening to promote at 63 and further attack White s camp Rook Defendsup to move 20 pieces in hand 歩歩987654321 香桂銀金王金 桂香1 飛 銀 2歩 歩歩歩歩歩 歩3 4 角 5 歩 6歩 歩歩馬歩歩 歩7 銀 飛 8香桂 金玉金銀桂香9 pieces in hand 歩歩 10 R 62 Rook Defendsup to move 20 pieces in hand 歩歩987654321 香桂銀金王金 桂香1 飛歩 銀 2歩 歩歩歩歩歩 歩3 4 角 5 歩 6歩 歩歩馬歩歩 歩7 銀 飛 8香桂 金玉金銀桂香9 pieces in hand 歩 11 P 52 At this point White needs to defend 63 However a gold can t be used for this purpose because that gold would come between the rook and the silver on rank 2 allowing Black to take the silver for free Therefore the suggested move is to use the rook to defend both 63 and 22 Black now drops a pawn to put the king in check This move tries to force White s rook to capture the pawn at 52 with White s rook Rx52 which will allow Black to successfully promote their bishop at 63 and attack White s rook Bx63 Kitao considers this position uncertain compared to the position in which the rook captures the tokin If White uses a gold to capture the checking pawn Gx52 then the rook s defense of the silver will be blocked allowing Black to capture the silver Rx22 However Hosking has a different suggestion which Kitao does not consider Hosking s silver variant Edit Tokin recaptureup to move 18 pieces in hand 歩歩987654321 香桂銀金王金 桂香1 飛 銀 2歩 歩歩歩歩歩 歩3 4 5 歩 6歩 歩歩馬歩歩 歩7 銀 飛 8香桂 金玉金銀桂香9 pieces in hand 角 歩歩 9 Sx23 Bishop Dropup to move 19 pieces in hand 歩歩987654321 香桂銀金王金 桂香1 飛 銀 2歩 歩歩歩歩歩 歩3 4 角 5 歩 6歩 歩歩馬歩歩 歩7 銀 飛 8香桂 金玉金銀桂香9 pieces in hand 歩歩 10 B 45 In contrast to Aono and Kitao Hosking recommends the silver taking the tokin along with the defense of this silver as shown below If White captures the tokin with the silver Black can now use their newly obtained bishop in the next move Black can drop their bishop to 45 or 36 attacking 63 Gold Defendsup to move 20 pieces in hand 歩歩987654321 香桂銀金王 桂香1 飛 金銀 2歩 歩歩歩歩歩 歩3 4 角 5 歩 6歩 歩歩馬歩歩 歩7 銀 飛 8香桂 金玉金銀桂香9 pieces in hand 歩歩 10 G 32 Bishop Promotionup to move 22 pieces in hand 歩歩987654321 香桂銀 王 桂香1 飛 金 金銀 2歩 歩馬歩歩歩 歩3 4 5 歩 6歩 歩歩馬歩歩 歩7 銀 飛 8香桂 金玉金銀桂香9 pieces in hand 歩歩歩 11 Bx63 G 52 If White tries to defend 63 with another piece now the rook s defense of the silver on 22 will be blocked allowing Black to capture the silver on 22 Thus Hosking s solution to defend the silver with a gold Black s bishop can promote but White can attack the bishop with a gold now since the rook is freed up from its defensive role Later White may capture more of Black s pawns with either their rook or horse leading to a stronger position for White Ignoring White s counterattack Edit White s Pawn Advanceup to move 6 pieces in hand 歩987654321 香桂銀金王金銀桂香1 飛 角 2歩 歩歩歩歩歩 歩3 飛 4 5 歩 6歩歩歩歩歩歩歩 歩7 角 8香桂銀金玉金銀桂香9 pieces in hand 歩 START White s Pawn Dropup to move 7 pieces in hand 歩987654321 香桂銀金王金銀桂香1 飛 角 2歩 歩歩歩歩歩歩歩3 飛 4 5 歩 6歩歩歩歩歩歩歩 歩7 角 8香桂銀金玉金銀桂香9 pieces in hand 4 P 23 If Black entertains the possibility of ignoring White completely and continuing their attack by dropping a pawn at 23 to attack White s bishop after move 6 the end result stills favors White 1 Bishop Captureup to move 10 pieces in hand 歩歩歩987654321 香桂銀金王金 桂香1 飛 銀 2歩 歩歩歩歩歩 歩3 飛 4 5 6歩と歩歩歩歩歩 歩7 角 8香桂銀金玉金銀桂香9 pieces in hand 角 4 Px87 5 Px22 Sx22 Rook Defendsup to move 11 pieces in hand 歩歩歩987654321 香桂銀金王金 桂香1 飛 銀 2歩 歩歩歩歩歩 歩3 4 5 6歩と歩歩歩歩歩 歩7 角 飛 8香桂銀金玉金銀桂香9 pieces in hand 角 6 R 28 Both White and Black s pawn can advance and promote and Black captures the bishop first White recaptures the tokin with a silver Since White s silver at 22 is defended by their rook and Black has no more pawns to drop Black s best move is to defend against White s attack by retreating to rank 8 Otherwise White will capture both Black s bishop as well as Black s silver and promote their rook at the same time Pawn Dropup to move 12 pieces in hand 歩歩987654321 香桂銀金王金 桂香1 飛 銀 2歩 歩歩歩歩歩 歩3 4 5 歩 6歩と歩歩歩歩歩 歩7 角 飛 8香桂銀金玉金銀桂香9 pieces in hand 角 6 P 86 With Black s rook defending 88 the number of pieces in an exchange is even White s tokin and rook vs Black s silver and rook However White can now drop a dangling pawn on 86 which threatens to promote on 87 attacking Black s silver At this point White will capture Black s bishop and break through their camp in future moves leaving Black in an inferior position Black cannot save their bishop and will probably lose either their knight or silver when White s dangling pawn promotes There is also the additional risk of White s rook promoting on the eighth file Although Black was able to get a bishop White has Black s bishop and also has more captured pieces Blunder White s failure to defend Edit Double Wing Attackup to move 4 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3 4 歩 歩 5 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 1 P 26 P 84 2 P 25 P 85 White s Pawn Advanceup to move 6 pieces in hand 987654321 香桂銀金王金銀桂香1 飛 角 2歩 歩歩歩歩歩歩歩3 4 歩 5 歩 6歩歩歩歩歩歩歩 歩7 角金 飛 8香桂銀 玉金銀桂香9 pieces in hand 3 G 78 P 86 According to joseki when both Black and White defend their bishops with a gold after White exchanges their rook pawn Black is recommended to drop a pawn to 8g for move 15 see above However if Black defends their bishop with gold but White does not and instead continues with a premature advance of their rook pawn joseki recommends a different strategy 3 Black s Counterattackup to move 9 pieces in hand 歩987654321 香桂銀金王金銀桂香1 角 2歩 歩歩歩歩歩歩歩3 歩 4 5 飛 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 歩 4 Px86 Rx86 5 P 24 Bishop Trapup to move 10 pieces in hand 歩歩987654321 香桂銀金王金銀桂香1 角 2歩 歩歩歩歩歩 歩3 歩 4 5 飛 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 歩 5 Px24 After White attacks 87 and the subsequent pawn exchange joseki recommends that Black start a counterattack at the head of White s bishop 23 by the rook pawn rather than trying to defensively attack White s rook The reason for this is that White s rook could simply fall back to a floating rook position on 84 thus preventing Black from making a pawn exchange on the second file and then controlling the flow of the game After Black s counterattack White will capture Black s pawn Bishop Trapup to move 11 pieces in hand 歩歩987654321 香桂銀金王金銀桂香1 角 2歩 歩歩歩歩歩歩歩3 歩 4 5 飛 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 6 P 23 Bishop Trapup to move 13 pieces in hand 歩987654321 香桂銀金王金銀桂香1 と 2歩 歩歩歩歩歩 歩3 歩 4 5 飛 6歩歩歩歩歩歩歩 歩7 角金 飛 8香桂銀 玉金銀桂香9 pieces in hand 角 6 P 87 7 Px22 This pawn capture by White allows Black to drop a pawn obtained from the eighth file pawn exchange at the head of White s bishop White can follow suit and also drop a pawn at the head of Black s bishop But Black captures White s bishop first Bishop Trapup to move 14 pieces in hand 歩歩987654321 香桂銀金王金 桂香1 銀 2歩 歩歩歩歩歩 歩3 歩 4 5 飛 6歩歩歩歩歩歩歩 歩7 角金 飛 8香桂銀 玉金銀桂香9 pieces in hand 角 7 Sx22 Rook Pawn Forkup to move 15 pieces in hand 歩歩987654321 香桂銀金王金 桂香1 銀 2歩 歩歩歩歩歩 歩3 歩 4 角 5 飛 6歩歩歩歩歩歩歩 歩7 角金 飛 8香桂銀 玉金銀桂香9 pieces in hand 8 B 75 After White recaptures Black s tokin on the second file Black drops the bishop on 75 creating a rook pawn fork Although it s possible that Black could also protect their bishop by capturing White s pawn with their gold 8 Gx77 this is a bad move since White s rook will be able to promote after taking Black s gold 8 Rx77 White now has a choice between retreating their rook back to their camp at 82 or attacking Black s bishop Bishop Promotionup to move 17 pieces in hand 歩歩987654321 香桂銀金王金 桂香1 銀 2歩 歩歩馬歩歩 歩3 歩 4 飛 5 6歩歩歩歩歩歩歩 歩7 角金 飛 8香桂銀 玉金銀桂香9 pieces in hand 歩 8 R 85 9 Bx53 Bishop Sidestepup to move 19 pieces in hand 歩歩987654321 香桂銀金王金 桂香1 銀 2歩 歩歩 馬歩 歩3 歩 4 飛 5 6歩歩歩歩歩歩歩 歩7 角金 飛 8香桂銀 玉金銀桂香9 pieces in hand 歩歩 9 R 55 10 Bx43 If the bishop on 75 is attacked as shown here R 85 then Black will promote their bishop on fifth file White s rook can continue to attack the bishop R 55 but Black can continue eluding capture with a sidestep to the fourth file Black Gains Knightup to move 23 pieces in hand 歩歩歩歩987654321 香桂銀金王金 馬香1 銀 2歩 歩歩 歩 歩3 歩 4 5 6歩歩歩歩 龍歩 歩7 角金 歩 飛 8香桂銀 玉金銀桂香9 pieces in hand 桂歩 10 Rx57 11 P 58 Rx47 12 Bx21 White s rook can now promote R 57 but Black can defend their king with a pawn drop P 58 White can capture another pawn Rx47 but Black can gain a knight Bx21 This position is thought to still favor Black Blunder Inferiority of silver Edit Silver Defenseposition after 6 moves 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3 4 歩 歩 5 6歩歩歩歩歩歩歩 歩7 角銀 飛 8香桂 金玉金銀桂香9 pieces in hand 3 S 78 Silver Defenseposition after 7 moves pieces in hand 987654321 香桂銀金王金銀桂香1 飛 角 2歩 歩歩歩歩 td, wikipedia, wiki, book, books, library,