Cairn Shift

Rebuild a trail cairn of flat stones on a fresh spot, one stone at a time, never laying a wider stone on a narrower one. Three cairns, visible best, no timer.

Each round shows three spots (a, b, c) with every stone stacked on spot a, widest at the bottom. Move one stone at a time; you may never lay a stone on a narrower stone. A round ends when the whole cairn stands on spot c. Round score: 100 points, minus 2 for every move beyond the exact fewest (never below 0). Three rounds of 4, 5 and 6 stones, max 300.

Commands: move a c (move the top stone from spot a to spot c), reset (start this round over), show, help. Spots are named a, b, c. Separate commands with semicolons. Invalid commands change nothing.