Chess960 战术题：天梯杀
两个重子一线一线地推进，切断所有退路。
1518 道题
3步杀：车到b6 (b2)
3步杀：王到b2 (c2)
3步杀：后到a5 (d8)
3步杀：后到b7 (a8)
2步杀：马到g8
3步杀：后到d7 (b7)
3步杀：后到b7 (f3·2)
3步杀：后到a8 (a6)
3步杀：车到b7 (b8·2)
攻击未易位的王：象到e3 (f2·4)
3步杀：后到f4 (h6)
攻击未易位的王：后到f6 (g5·3)
3步杀：兵到e6 (d5·2)
3步杀：兵到b6 (a5·2)
3步杀：后到c6 (b6·4)
3步杀：后到f5 (g4·3)
3步杀：后到d8 (c8·3)
3步杀：车到f7 (f1·2)
3步杀：后到d4 (d2)
3步杀：后到d8 (c7)
3步杀：马到d7 (b6)
3步杀：象到d5 (a2·2)
3步杀：马到h6 (g4·3)
3步杀：兵到d4 (c3)
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