r3kbnr/2n1pp1p/p1b3p1/1q1p4/1p1N4/P1p1BPKP/RPP1P1P1/1NQ2BR1 w k - 0 23
FEN state: r3kbnr/2n1pp1p/p1b3p1/1q1p4/1p1N4/P1p1BPKP/RPP1P1P1/1NQ2BR1 w k - 0 23 ; Best move: d4b5
The current state of the chess board is: Black rook at a8, black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black knight at c7, black pawn at e7, black pawn at f7 and black pawn at h7. Black pawn at a6, black bishop at c6 and black pawn at g6. Black queen at b5 and black pawn at d5. Black pawn at b4 and white knight at d4. White pawn at a3, black pawn at c3, white bishop at e3, white pawn at f3, white king at g3 and white pawn at h3. White rook at a2, white pawn at b2, white pawn at c2, white pawn at e2 and white pawn at g2. White knight at b1, white queen at c1, white bishop at f1 and white rook at g1. Black kingside is the only castle move available. Half move number is 0. Full move number is 23. White to move.