Glassboard 2-Player
Chess, in the open — two humans, one transparent handicap.
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Testing: open this same page in a second Safari window, pick White in one and Black in the other, and play both roles side by side. The weaker player (by Elo) is assisted; the stronger plays unassisted — and every bit of help appears in both windows' glass-box. Set ratings, then click New game (either window) to (re)start.