rq2k1n1/p2pB3/1p1r3b/Q2n2pp/P1p1b2P/N5P1/2PPNP2/R2K1B1R b q - 2 20
FEN state: rq2k1n1/p2pB3/1p1r3b/Q2n2pp/P1p1b2P/N5P1/2PPNP2/R2K1B1R b q - 2 20 ; Best move: b6a5
The current state of the chess board is: Black rook at a8, black queen at b8, black king at e8 and black knight at g8. Black pawn at a7, black pawn at d7 and white bishop at e7. Black pawn at b6, black rook at d6 and black bishop at h6. White queen at a5, black knight at d5, black pawn at g5 and black pawn at h5. White pawn at a4, black pawn at c4, black bishop at e4 and white pawn at h4. White knight at a3 and white pawn at g3. White pawn at c2, white pawn at d2, white knight at e2 and white pawn at f2. White rook at a1, white king at d1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 2. Full move number is 20. Black to move.