r1bq2n1/1pppp1r1/2n1kb1p/p1P2pp1/3P1QP1/P6P/1P1KPP2/RNB2BNR b - - 4 13
FEN state: r1bq2n1/1pppp1r1/2n1kb1p/p1P2pp1/3P1QP1/P6P/1P1KPP2/RNB2BNR b - - 4 13 ; Best move: g5f4
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8 and black knight at g8. Black pawn at b7, black pawn at c7, black pawn at d7, black pawn at e7 and black rook at g7. Black knight at c6, black king at e6, black bishop at f6 and black pawn at h6. Black pawn at a5, white pawn at c5, black pawn at f5 and black pawn at g5. White pawn at d4, white queen at f4 and white pawn at g4. White pawn at a3 and white pawn at h3. White pawn at b2, white king at d2, white pawn at e2 and white pawn at f2. White rook at a1, white knight at b1, white bishop at c1, white bishop at f1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 4. Full move number is 13. Black to move.