Beach Go

    Keywords: Variant

Using discs that may or may not touch each other introduces problems that require a software judge to decide if discs touch or not (I'm referring to Go on a board without lines)

Let me propose following variant. It attempts to reduce Go to a most primitive form, which could be played e.g. on a beach with pebbles, shells, etc...

This variant is somewhat related to Topological Go, Cathedral game as well as [ext] pentominoes.

First I propose the ideal form.

Proposal

hardware

  1. The playing surface is magnetic, of possibly irregular shape
  2. 'Stones' are two-dimensional metal shapes ("extrusions"?) with significant thickness (e.g. 5 mm);
  3. players are electrically wired (low voltage, of course) so that if they touch the playing surface, their move is invalid, or equal to suicide (to decide)

rules

  1. two stones are connected if the attacking player can play a move that touches the two stones
  2. a group is dead if the owning player cannot add a stone to it
  3. stone counting is in effect

Discussion

  1. goban shape is irrelevant but can be decided or fixed by convention
  2. playing shapes ('stones') can be regularly shaped (eg discs) or not, can be identical or not (eg in case this gets programmed, generated randomly such as in Tetrix).
  3. Why two-dimensional *extruded* shapes ? The idea is that a player should drop the shape in place (i.e. without touching the surface and disturbing existing shapes). As a result, either the shape will completely stick to the playing surface, or part of it will be elevated by a shape that is already on the goban. In which case the move is rejected or considered suicide. The significant thickness ensures that a shape can only stick completely to the surface, or it will stick out.
  4. the 'dead group' rule is also applicable to dropped shapes: if they didn't kill a group, but the player cannot add a shape, they are dead and thus removed (=suicide rule)
  5. of course the metal and electric stuff cannot be found on a beach... The idea is that shapes should not touch each other - this remains the most difficult part of the rules.

This is a copy of the living page "Beach Go" at Sensei's Library.
(OC) 2012 the Authors, published under the OpenContent License V1.0.
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