牵制:象到g5
li-05cR1战术主题
牵制:棋子一动,身后更有价值的目标就会暴露。
难度2306 ShuffleRating——专家水平——很少有人一次解出。
白方走棋——找出最佳续着
How to recognize this tactic
A pin freezes a piece in front of a more valuable one behind it. Scan the ranks, files and diagonals your bishop, rook or queen controls: if an enemy piece cannot move without exposing its king or queen, it is pinned and can be piled on or bypassed.
General method: before you move, list the forcing candidates — every check, every capture, every direct threat — and calculate those first. The solution to a tactic is almost always among them.
棋盘上的局面
白方:王 g1, 后 h3, 车 a1 h5, 象 d3 f4, 兵 a2 b2 c2 f2 h2 c3 g3。
黑方:王 h8, 后 f6, 车 a8 f8, 象 f3, 马 a5, 兵 b6 d6 e6 h6 a7 c7 f7 g7。
棋盘上有13枚白棋和14枚黑棋;该题局面出现在第18回合之后。
The position in numbers
Black are ahead by 1 points of material (32 against 33; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on g1, the black king on h8.
It is White to move on move 18, with 43 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 7 pawns, Black 8. No file is fully open, so the heavy pieces have to be pried in. Half-open for White: d, e.
White hold the bishop pair, an edge in open lines. The White king has 1 empty squares to step to right now — the fewer they are, the closer a mating net.
解答与讲解
主要变着
18. Bg5 Qxg5 19. Rxg5
为何奏效
- 好棋!象到g5保持压力(+4.3)。
- 好棋!车到g5保持压力(+4.7)。
- 你赢得一子——后。
- 若改走Qxg5,则Rxg5,你赢得后。
Move by move
- 18. Bg5 — 象 to g5
- Qxg5 — 后 to g5 (capture)
- 19. Rxg5 — 车 to g5 (capture)
本题的题型
绝对牵制
一个子被牵制在王前——按规则它根本不能动。
绝对牵制:一个棋子被冻结在自己国王与你的远程棋子之间的直线上——按规则它根本不许移动。特征是三个单位排在一条直线上:你的象、车或后,敌方棋子,以及它身后的敌方国王。被牵制的棋子既不能进攻也不能防守,就当它不在棋盘上。放心地再次攻击它,最好用兵——它无权逃跑。
静着
既不将军也不吃子——但正是这步不起眼的棋决定了胜负。
静着:既不将军也不吃子,却恰恰是它决定胜负——制造无法招架的威胁,或夺走国王最后的格子。这是最难的一类着法:眼睛总在搜寻轰鸣的重击,赢棋的却是一次低调的挪动。线索:所有强制尝试都撞上防守——那就找那步单纯加强威胁或抢占格子的棋。训练自己发问:如果不吃不将,只是静静地加强,会怎样?
来源
源自 Lichess 题库(CC0)。
题包 015
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