Chess vs Computer Unblocked

Chess vs Computer is a compact chess program by Zhang Zeyu that shows its thinking instead of hiding it. After each reply, it tells you how many positions it examined, how long it took and how many positions per second it managed, while a bar beside the board swings toward whichever side is ahead. That makes it a handy practice partner: you can turn the engine up or down, ask for a hint, take moves back and see the evaluation change. Play it unblocked here without installing anything.

What Happens on the Board

You are White and you move first. Drag a piece to its square and release it; if the move is illegal, the piece simply returns. With a mouse, hovering over a piece shades the squares it can legally reach.

Black’s answer comes from a minimax search with alpha-beta pruning. The engine scores positions using piece values plus tables that reward good squares, so it cares about development and centralization, not only material.

Every standard rule is in place, including castling and en passant. A yellow frame marks your last move and a blue frame marks the reply. Below the advantage bar, a status line warns you about check and announces how the game finished: checkmate, stalemate, threefold repetition, the 50-move rule or insufficient material.

Chess vs Computer controls

To do this	Mouse	Touch
Make a move	Drag the piece to its new square	Drag the piece to its new square
See where a piece can go	Hover over one of your pieces	—
Take back your move and Black's answer	Click "Undo"	Tap "Undo"
Step forward again after undoing	Click "Redo"	Tap "Redo"
Adjust engine strength or hints	Open "Settings" and pick a value or tick the box	Open "Settings" and pick a value or tick the box
Jump to an opening or reset the board	Open "Opening Positions" and click a button	Open "Opening Positions" and tap a button

A Training Plan That Works

1. Find your depth. Begin at depth 1 or 2 and win a few games before moving up. Every extra level of depth makes the engine noticeably sharper and a bit slower to reply.
2. Treat the bar as an alarm. If the advantage swings hard toward Black right after your move, something is hanging. Undo and look again.
3. Rehearse openings. The opening buttons load the Ruy Lopez, the Italian Game or the Sicilian Defense. Starting from those positions lets you practice the middle game that follows.
4. Compare ideas. Undo takes back both your move and Black’s reply. Try two candidate moves in turn and see which one the bar prefers.
5. Ask for help sparingly. The suggested-move outline is useful when you are lost, but you will learn more by guessing first and checking second.
6. Mind promotion. Pawns always become queens, so a sudden extra queen can stalemate a lonely king if you are careless.

Best Uses for This Engine

This is not a polished chess site with ratings and online opponents. It is a focused sparring board, and that is its strength. Beginners can set it low and win, intermediate players can push it to depth 4 or 5 and get a real fight, and curious players can run Computer vs. Computer to see how search depth changes the play.

For other strategy games with different pieces and rules, try Xiangqi or Shogi. If you want something lighter, Checkers uses a similar board with far fewer rules.