r4b2/3nkp1r/p3pn1p/1p4pP/QPNP2P1/P1P4N/4PPb1/1RBK1B2 b - - 2 20
FEN state: r4b2/3nkp1r/p3pn1p/1p4pP/QPNP2P1/P1P4N/4PPb1/1RBK1B2 b - - 2 20 ; Best move: b5a4
The current state of the chess board is: Black rook at a8 and black bishop at f8. Black knight at d7, black king at e7, black pawn at f7 and black rook at h7. Black pawn at a6, black pawn at e6, black knight at f6 and black pawn at h6. Black pawn at b5, black pawn at g5 and white pawn at h5. White queen at a4, white pawn at b4, white knight at c4, white pawn at d4 and white pawn at g4. White pawn at a3, white pawn at c3 and white knight at h3. White pawn at e2, white pawn at f2 and black bishop at g2. White rook at b1, white bishop at c1, white king at d1 and white bishop at f1. Both players have exhausted their castles. Half move number is 2. Full move number is 20. Black to move.