1n4r1/r1p2pk1/pp3np1/3q2Np/1P1bP1b1/P3B1P1/R3PP1P/1NQ1KB1R w - - 0 21
FEN state: 1n4r1/r1p2pk1/pp3np1/3q2Np/1P1bP1b1/P3B1P1/R3PP1P/1NQ1KB1R w - - 0 21 ; Best move: e4d5
The current state of the chess board is: Black knight at b8 and black rook at g8. Black rook at a7, black pawn at c7, black pawn at f7 and black king at g7. Black pawn at a6, black pawn at b6, black knight at f6 and black pawn at g6. Black queen at d5, white knight at g5 and black pawn at h5. White pawn at b4, black bishop at d4, white pawn at e4 and black bishop at g4. White pawn at a3, white bishop at e3 and white pawn at g3. White rook at a2, white pawn at e2, white pawn at f2 and white pawn at h2. White knight at b1, white queen at c1, white king at e1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. White to move.