Sources and verification

Sources consulted

• Elevens (new tab) (Wikipedia, in English): a family of solitaire games where two cards adding up to 11 and sets of three face cards (Jack, Queen, King) are removed, and the game ends when no more cards can be removed
• Patience (game) (new tab) (Wikipedia, in French): French solitaire terminology (“tableau”, “réserve”, “réussite” or “patience”)

Links accessed on 30 October 2026. Half Moon has no definitive rulebook: the rules described on this site are primarily those of the Half Moon Solitaire app, as read in its code; the family's traditional rules are cited separately.

How the examples are verified

Before each publication, a program checks the 2 example deals and every figure on the site:

• the deal is recalculated from its game code, using the same shuffle as the app, and compared with the deal produced by the app's code;
• 104 cards, with two copies of each, 12 piles of 8 cards and 8 reserve cards;
• each move in the winning games is replayed tap by tap and must remove its cards according to the app's rules; each game must end in victory;
• the score, move count and remaining cards are recalculated and compared with those in the app;
• the rejected taps shown on the site remove nothing in the app, and the remaining selection is the same;
• the rules cited (sum of 11, face cards in sets of three, playable cards, scoring, end of the game) are checked against the app's code.

The strategy tips are presented as tips, separate from the rules. The won games were found by a program that tries moves and backtracks: they prove that these deals can be won, but say nothing about the difficulty of other deals. A mistake? Write to us through the contact page.