Encyclopaedia of Chess Middlegames
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Rb1+!
pv 1. ... Rb1+ 2. Kxb1 Rb6+ 3. Kc1 Bb2+ 4. Kd2 Bc3+ 5. Kc1 Rb1+ 6. Kxb1 Qb4+ 7. Kc1 Qb2#
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