Canfield vs Klondike
Canfield wins about 8% of deals to Klondike's 82% — a 13-card reserve, four columns instead of seven, and a random wrapping foundation rank do all the damage.
On paper the two games look like cousins: both build foundations by suit and both build the tableau down in alternating colors. The resemblance ends at the setup. Klondike gives you seven columns and starts every foundation on an Ace you can see coming. Canfield hands you four columns, buries thirteen cards in a reserve you can only peel one at a time, and picks the foundation's starting rank at random — so the sequence you need wraps past the King and you have to track it in your head.
I win Klondike often enough to feel competent and Canfield rarely enough to remember each victory by name. If Klondike is a game you can win on autopilot, Canfield is the one that reminds you a casino owner designed it to take your money. Play Klondike to relax; play Canfield when you want the tableau to fight back.