r2qk1nr/pp4b1/8/3ppbpn/1Pp1Pp1P/N2P1P1R/P1P1N3/1RBQKB2 w kq - 2 21
FEN state: r2qk1nr/pp4b1/8/3ppbpn/1Pp1Pp1P/N2P1P1R/P1P1N3/1RBQKB2 w kq - 2 21 ; Best move: e4f5
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8, black knight at g8 and black rook at h8. Black pawn at a7, black pawn at b7 and black bishop at g7. Black pawn at d5, black pawn at e5, black bishop at f5, black pawn at g5 and black knight at h5. White pawn at b4, black pawn at c4, white pawn at e4, black pawn at f4 and white pawn at h4. White knight at a3, white pawn at d3, white pawn at f3 and white rook at h3. White pawn at a2, white pawn at c2 and white knight at e2. White rook at b1, white bishop at c1, white queen at d1, white king at e1 and white bishop at f1. Black kingside and black queenside castles are available. Half move number is 2. Full move number is 21. White to move.