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Retrograde Analysis
Chess Problems

by Leo Mano

AR07 - Leo Mano
(14x14) b6N - 3p3B - 1q1p2p1 - ppk5 - 5b2 - 1PP1p1pP - P1nBP1RP - 2rRrNKQ

White retracts, Black then retracts and helps White mates in 1 (4 solutions).


White and Black retracts / Helpmates in 1
a) 1 g8-h7, c7xd6 / 1 c6, e4++
b) 1 f7-h8, c7xd6 / 1 c6, g3++
c) 1 f2-g2, c7xd6 / 1 d5, d5++
d) 1 b2-b3, c7xd6 / 1 c4, b3++

If White retracts g8xh7? or f7xh8? then Black can't retracts c7xd6 or c7xd6 becose it's illegal and the problem has no solution. There's no other legal White's retract move.

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(p)2000-2001 by Leo Mano. Rio de Janeiro - RJ, Brazil.