🧠🧠🧠 Faulty Shield (Hybrid Exercise)

Hybrid Puzzle: The audio will tell you where each of the pieces on the board are, then read a series of moves from that position. When prompted, try to identify the best next move.

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FEN for today's exercise:
r1bq1rk1/1pp2ppp/2n1pn2/4N3/1ppP4/6P1/PP2PPBP/RN1Q1RK1 w - - 2 1

PGN for today's exercise:
[FEN "r1bq1rk1/1pp2ppp/2n1pn2/4N3/1ppP4/6P1/PP2PPBP/RN1Q1RK1 w - - 2 1"] 1. Bxc6 bxc6 2. Nxc4 Ba6 3. Ne5 Qd5 4. Qc2 Bb5 5. Rd1 { What is the best move for Black? } *

And the answer is...
5... Ba4 6. b3 Bxb3