r1bq2nr/pppk4/n2p1ppp/1N4BP/P2p2P1/8/RPP1PP2/Q3KBNR b K - 2 13
FEN state: r1bq2nr/pppk4/n2p1ppp/1N4BP/P2p2P1/8/RPP1PP2/Q3KBNR b K - 2 13 ; Best move: a6b4
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black knight at g8 and black rook at h8. Black pawn at a7, black pawn at b7, black pawn at c7 and black king at d7. Black knight at a6, black pawn at d6, black pawn at f6, black pawn at g6 and black pawn at h6. White knight at b5, white bishop at g5 and white pawn at h5. White pawn at a4, black pawn at d4 and white pawn at g4. White rook at a2, white pawn at b2, white pawn at c2, white pawn at e2 and white pawn at f2. White queen at a1, white king at e1, white bishop at f1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 2. Full move number is 13. Black to move.