1nb2knr/1pppbppp/1r6/pP1Pp3/P4PPq/8/2PNPN1P/R1BQK1RB b Q - 4 15
FEN state: 1nb2knr/1pppbppp/1r6/pP1Pp3/P4PPq/8/2PNPN1P/R1BQK1RB b Q - 4 15 ; Best move: e7b4
The current state of the chess board is: Black knight at b8, black bishop at c8, black king at f8, black knight at g8 and black rook at h8. Black pawn at b7, black pawn at c7, black pawn at d7, black bishop at e7, black pawn at f7, black pawn at g7 and black pawn at h7. Black rook at b6. Black pawn at a5, white pawn at b5, white pawn at d5 and black pawn at e5. White pawn at a4, white pawn at f4, white pawn at g4 and black queen at h4. White pawn at c2, white knight at d2, white pawn at e2, white knight at f2 and white pawn at h2. White rook at a1, white bishop at c1, white queen at d1, white king at e1, white rook at g1 and white bishop at h1. White queenside is the only castle move available. Half move number is 4. Full move number is 15. Black to move.