r1b2kr1/p3qpn1/n1p1p3/1p1p4/5P1p/P3PK1N/1PP3PP/R1BN1BR1 w - - 0 21
FEN state: r1b2kr1/p3qpn1/n1p1p3/1p1p4/5P1p/P3PK1N/1PP3PP/R1BN1BR1 w - - 0 21 ; Best move: g2g4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at f8 and black rook at g8. Black pawn at a7, black queen at e7, black pawn at f7 and black knight at g7. Black knight at a6, black pawn at c6 and black pawn at e6. Black pawn at b5 and black pawn at d5. White pawn at f4 and black pawn at h4. White pawn at a3, white pawn at e3, white king at f3 and white knight at h3. White pawn at b2, white pawn at c2, white pawn at g2 and white pawn at h2. White rook at a1, white bishop at c1, white knight at d1, white bishop at f1 and white rook at g1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. White to move.