#expert

Canfield is a single-deck solitaire game with only an 8% win rate, featuring a 13-card reserve pile, four tableau columns, and a stock pile. Foundation piles begin on a randomly chosen rank rather than Ace, and all four suits must build upward from that rank, wrapping from King back to Ace as needed.

Forty Thieves is a two-deck solitaire game with only a 10% win rate, dealing 40 cards face-up into ten tableau columns. Players build eight foundation piles from Ace to King by suit, moving one card at a time in same-suit descending sequences. It is among the most difficult classic solitaire variants.

Russian Solitaire is a single-deck Yukon variant with only a 13% win rate. All 52 cards are dealt into seven tableau columns. Unlike Yukon, sequences must build down by suit only — not alternating colors. Any face-up card or group may move regardless of internal order. Foundations build up by suit from Ace to King.