ref: 3ae90bcd3a345a932c6bc62cbb985a610caa78f2
parent: 3264d56791081138348524ce067f87307833d4b0
author: Simon Tatham <anakin@pobox.com>
date: Tue Nov 14 07:41:46 EST 2023
Map: document explicitly that initial regions are immutable. Chris Boyle reports that a few users of the Android port were confused by this, e.g. https://github.com/chrisboyle/sgtpuzzles/issues/624 . (That seems surprising to me, since I view Map as extremely closely related to Solo - both are special cases of the general game class 'here is a partial k-colouring of a graph, find the unique total k-colouring that extends it', just with different ranges of k and different valid graphs. And surely nobody approaches a Sudoku puzzle and expects to be able to rub out provided clues they don't like! But I suppose if you're thinking of Map as a completely separate puzzle then perhaps that analogy doesn't have the same force.)
--- a/puzzles.but
+++ b/puzzles.but
@@ -1923,7 +1923,7 @@
to colour each region with one of four colours, in such a way that
no two regions sharing a boundary have the same colour. You are
provided with some regions already coloured, sufficient to make the
-remainder of the solution unique.
+remainder of the solution unique, and these cannot be changed.
Only regions which share a length of border are required to be
different colours. Two regions which meet at only one \e{point}