1. Qxa3 – Rxe8#

1. Bxc6 – Qxe7+
2. Kg8 – Qxe8+
3. Bxe8 – Rxe8#

1. g6 – Qxe7+
2. Kg7 – Bxe8 and the black defence is destroyed.

The initial move of the Bishop is lethal even if it’s not obvious at first glance.

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