Solution
1. Rxb5 wins material by overloading the defender of the a8-square (the black queen).
Ie. 1. Rxb5 Qxb5 allows Qa8+, followed by Qxb7
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1. Rxb5 wins material by overloading the defender of the a8-square (the black queen).
Ie. 1. Rxb5 Qxb5 allows Qa8+, followed by Qxb7