Chess (itch) (Harsha-Games)

Welcome to Harsha Chess - "Game of Kings". FAQs:
- "Why invalid move?" Quite likely it puts you in check.
- "Castling doesn't work!" It does, see castling rules.
- "Too difficult!" Switch to junior mode (press 'j').
- "Too easy!" Play on Forkphorus (link below), use fast system.

- "Opponent pawn captured my pawn which had already passed it!" That's called 'en-passant'.
- "How to castle?" Move the king two squares; none of the passed squares must be in check, and neither king nor rook must have been moved before.
- "How to play en-passant?" Move your pawn diagonally by one square, behind the opponent pawn which just moved two squares.
- "Can you increase the engine's playing strength?" It has been tuned a lot already, and we probably reached the end of the rope now. A  chess engine will never play at the level of one implemented in C or C++. Scratch is slow due its interpreted nature, every variable access triggers a table-lookup by name, it doesn't have bitwise operations for bitboards, and uses variants with constant value conversions, etc.

- Easy: 5 seconds think time (Junior: 0 seconds)
- Medium: 15 seconds think time (Junior: 0 seconds)
- Difficult: 30/20 seconds midgame/endgame think time (Junior: 1 second)

Press 'c' to toggle 60 seconds think time on Difficult
Press 'd' for iterative deepening debug info