Solution
1. Qxc8 Rxc8 2. Bb7! overloads the c8-Rook since white is threatening Bxc8 and it can’t defend against both Rxc1 AND Rd8#
Ie. 1. Qxc8 Rxc3 2. Bb7 Rb8 3. Rxc1 (winning the bishop) Rxb7? 4. Rc8#
Exercise #132
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1. Qxc8 Rxc8 2. Bb7! overloads the c8-Rook since white is threatening Bxc8 and it can’t defend against both Rxc1 AND Rd8#
Ie. 1. Qxc8 Rxc3 2. Bb7 Rb8 3. Rxc1 (winning the bishop) Rxb7? 4. Rc8#