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