peek at solution solve puzzle
quality: difficulty: solvability: moderate lookahead
Puzzle Description Suppressed:Click below to view spoilers
#1: Web Paint-By-Number Robot (webpbn) on Apr 19, 2023
Found to have a unique solution by wombatilim.#2: Web Paint-By-Number Robot (webpbn) on Apr 19, 2023
Found to be solvable with moderate lookahead by wombatilim.#3: Wombat (wombatilim) on Apr 19, 2023 [HINT]
Initial line & color logic completes 95% with only black remaining.
C16: EL marks R26 white. R22-24 is an invalid position for the remaining 3, but however else it gets placed, R20C17 is black. LL.
R30: Whether the remaining 1 goes to C20 or C22, R29C21 is white.
R27: If the remaining 2 is in C20-21, R28C15 is black and R24 C15 and C21 are both white. This makes R24 invalid, so R27C21 is white.
R27: If the remaining 2 is in C19-20, R24C18 and R28C15 are both black, and R24C15 is white. This makes R24 invalid, so R27C18 is black.
LL to finish.
Show: Spoilers
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