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Qc7 !! if Rb8 then Rd8
1 Qc7, threatening 2 Q:b7, 2 Q:c8 and 2 Rd8
Qc7
1. Qc7
Mate follows on the eighth rank.
If Black moves the Queen to the eighth rank, to defend the castle then Qxb7 mate.
Qc7
if … Rxc7 then
Rd8#
… Rb8
Rd8 and the rook is lost (Rxd8 Rxd8# of course)
Unless I am overlooking something obvious, white needs to take care of the threat of Rc1. He can interpose the queen c7 or c5, or the rook at c7. However one these forces black to exchange the queens, and allows the capture at g7, too:
1. Qc7 Qc6
Black has no other option- Rb8 allows Rd8, as does other rook moves along the 8th rank:
2. Qc6 bc6
3. Rg7 c5
4. Kf1 c4
5. Ke2 and this should be winning for white.
1. Qc7 (to prevent black checkmate threat on c1 and to start a counter-threat on c8)
1. – , Qc6 (the only defence, all other moves lead to an immediate defeat for black: a). 1. – , Rxc7? 2. Rd8+, Rc8 3. Rxc8#; b). 1. – , Rb8 2. Rd8, etc.; c) 1. – , Re-f-g-h8 2. Rd8+ or 2. Qd8+ and checkmate in the next move)
2. Qxc6, bxc6 3. Rxg7
White is two pawns up and has a unbroken pawn chain on the king side ready to advance.
Now, there isn’t much black can do in this situation, other than to push his c-pawn forward, or try to maneuver with his rook.
For example:
3. – , c5 4. Kf1, c4 5. Ke1, c3 6. Kd1, c2+ 7. Kc1 and black’s remaining counterplay has come to a definitive end.
Black king is out of play and white f-g-h-pawns are ready for a decisive march forward. White wins.
1. Qc7 Rb8
2. Rd8
Qg5
Qg7