r4bqr/2p1k1p1/2np1n2/1b3pBp/Q3p2P/P3PP2/3KN1P1/N1R2B1R w - - 4 23
FEN state: r4bqr/2p1k1p1/2np1n2/1b3pBp/Q3p2P/P3PP2/3KN1P1/N1R2B1R w - - 4 23 ; Best move: a4b5
The current state of the chess board is: Black rook at a8, black bishop at f8, black queen at g8 and black rook at h8. Black pawn at c7, black king at e7 and black pawn at g7. Black knight at c6, black pawn at d6 and black knight at f6. Black bishop at b5, black pawn at f5, white bishop at g5 and black pawn at h5. White queen at a4, black pawn at e4 and white pawn at h4. White pawn at a3, white pawn at e3 and white pawn at f3. White king at d2, white knight at e2 and white pawn at g2. White knight at a1, white rook at c1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 4. Full move number is 23. White to move.