Side Pawn Capture Bishop-3c

Side Pawn Capture
Bishop-3c Variation
△ pieces in hand: 歩歩
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香桂銀金王 銀桂香a
      金  b
歩 歩歩歩歩角 歩c
      飛  d
         e
 飛歩      f
歩  歩歩歩歩 歩g
 角金      h
香桂銀 玉金銀桂香i
▲ pieces in hand: 歩歩歩

In shogi, Side Pawn Capture Bishop-3c (横歩取り3三角 or 横歩取り△3三角 yokofudori san-san kaku) is a set of variations stemming from the Side Pawn Capture opening, in which White (後手 gote) first trades pawns on the eighth file and then blocks Black (先手 sente) from trading bishops by moving White's bishop to the 3c square.

This is the most common variation of the Side Pawn opening.

Development

Side Pawn Capture
up to move 15
△ pieces in hand: 歩歩
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香桂銀金王 銀桂香a
      金角 b
歩 歩歩歩歩  歩c
      飛  d
         e
 飛歩      f
歩  歩歩歩歩 歩g
 角金      h
香桂銀 玉金銀桂香i
▲ pieces in hand: 歩歩歩

The moves preceding this variation follow the standard modern Side Pawn opening with White's eighth file pawn trade – namely, for instance, 1. P-7g P-3d, 2. 2. P-2d P-8d, 3. P-2e P-8e, 4. G-7h G-3b, 5. P-2d Px2d, 6. Rx2d P-8f, 7. Px8f Rx8f, 8. Rx3d. The moves here are the first 15 moves up until Black's capture of White's side pawn by the rook which results in the rook being positioned on the 3d square as shown in the adjacent diagram. (See Side Pawn Capture for explication.)

B-3c
up to move 16
△ pieces in hand: 歩歩
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香桂銀金王 銀桂香a
      金 b
歩 歩歩歩歩角 歩c
      飛  d
         e
 飛歩      f
歩  歩歩歩歩 歩g
 角金      h
香桂銀 玉金銀桂香i
▲ pieces in hand: 歩歩歩

8. ... B-3c. White moves their bishop up to the third file preventing Black from trading the bishops.

White must stop Black's bishop trade to avoid a trap. (This may be done also by blocking with a knight (N-3c) or by White initiating the bishop trade from their side.)

From here, starts the Aerial Fight (空中戦 kuuchuusen) opening strategies, which are also known as the Naito opening, which is named after (now retired) professional player Kunio Naitou (内藤国雄). The aerial term refers to the way both players' rooks are positioned above their camps on the middle d–f ranks.

Retreating Black's rook

Rook Retreat
up to move 17
△ pieces in hand: 歩歩
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香桂銀金王 銀桂香a
      金  b
歩 歩歩歩歩角 歩c
        d
        e
 飛歩   飛  f
歩  歩歩歩歩 歩g
 角金      h
香桂銀 玉金銀桂香i
▲ pieces in hand: 歩歩歩
9. R-3f   ...

9. R-3f. The most common move has been for Black to retreat their rook back to the f rank protecting their side pawn on 7f from being captured by White's rook.

After this move, there are numerous variations.

△ Rook-8d variation

△R-8d
up to move 18
△ pieces in hand: 歩歩
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香桂銀金王 銀桂香a
      金  b
歩 歩歩歩歩角 歩c
 飛       d
        e
 歩   飛  f
歩  歩歩歩歩 歩g
 角金      h
香桂銀 玉金銀桂香i
▲ pieces in hand: 歩歩歩
9. ...   R-8d

9. ... R-8d. The △R-8d opening frequently starts by moving the rook back immediately.

However, it is also possible to postpone this move and instead first move the left silver to the 2b square, which is a needed move anyway. Postponing the rook retreat allows White to wait and see whether Black will next drop a pawn to the 8g square. If Black does do this, then White now has the option of playing △R-8d but also the △R-8e option as well. As a result of this flexibility, 9. ...S-2b has become the more common move in professional games compared with 9. ...R-8d and is, thus, less revealing of White's strategy. Nonetheless, 9. ...R-8d, 10. R-2f S-2b, 11. P*8g is the older move order and can be transposed as 9. ...S-2b, 10. P*8g R-8d, 11. R-2f. (The 9. ...S-2b, 10. P*8g sequence is shown below with the middle rank rook position in §△R-8e variation.)

△R-8d
up to move 21
△ pieces in hand: 歩歩
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香桂銀金王  桂香a
      金銀 b
歩 歩歩歩歩角 歩c
 飛       d
         e
  歩    飛 f
歩歩 歩歩歩歩 歩g
 角金      h
香桂銀 玉金銀桂香i
▲ pieces in hand: 歩歩
11. P*8g   ...

△ King-5b variation

△K-5b
up to move 22
△ pieces in hand: 歩歩
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香桂銀金  桂香a
    王 金銀 b
歩 歩歩歩歩角 歩c
 飛       d
         e
  歩    飛 f
歩歩 歩歩歩歩 歩g
 角金      h
香桂銀 玉金銀桂香i
▲ pieces in hand: 歩歩
11. ...   K-5b
▲ King-6h variation
▲K-6h
up to move 23
△ pieces in hand: 歩歩
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香桂銀金   桂香a
    王 金銀 b
歩 歩歩歩歩角 歩c
 飛       d
         e
  歩    飛 f
歩歩 歩歩歩歩 歩g
 角金玉     h
香桂銀 金銀桂香i
▲ pieces in hand: 歩歩
12. K-6h   ...

△ Rook-8e variation

△R-8e
up to move 20
△ pieces in hand: 歩歩
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香桂銀金王  桂香a
      金銀 b
歩 歩歩歩歩角 歩c
         d
 飛       e
 歩   飛  f
歩歩 歩歩歩歩 歩g
 角金      h
香桂銀 玉金銀桂香i
▲ pieces in hand: 歩歩歩
10. ...   R-8e

△ King-4a variation

△R-8e △K-4a
up to move 22
△ pieces in hand: 歩歩
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香桂銀金王 桂香a
      金銀 b
歩 歩歩歩歩角 歩c
         d
 飛       e
  歩    飛 f
歩歩 歩歩歩歩 歩g
 角金      h
香桂銀 玉金銀桂香i
▲ pieces in hand: 歩歩歩
11. ...   K-4a

Aono variation

Aono
up to move 17
△ pieces in hand: 歩歩
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香桂銀金王 銀桂香a
      金  b
歩 歩歩歩歩角 歩c
      飛  d
         e
 飛歩      f
歩  歩歩歩歩 歩g
 角金 玉    h
香桂銀 金銀桂香i
▲ pieces in hand: 歩歩歩
9. K-5h   ...

Aono Side Pawn (青野流 aono-ryū) is one of the Side Pawn Capture variants. It is named after professional Teruichi Aono. (This not to be confused with Aono's Yagura and Bishop Exchange variations.)

9. K-5h. Instead of retreating their rook to the f rank (see § Retreating Black's rook above), Black keeps their rook positioned on the 3d square and moves their king straight up to the h rank protecting the line of pawns above it.

By not moving their rook to the 3f square as in the most common variations, Black's third file pawn can be advanced allowing for their right knight to develop early to the 3g square.

One common positioning of White's king is on the 4b square.

See also

Bibliography

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