Conway’s soldiers

E163258

Conway’s soldiers is a mathematical puzzle and thought experiment in combinatorial game theory that explores how far checkers-like pieces can advance on an infinite grid under specific movement rules.

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Statements (46)

Predicate Object
instanceOf combinatorial game theory problem
mathematical puzzle
peg solitaire variant
thought experiment
appearsIn Winning Ways for your Mathematical Plays
application example problem in combinatorial game theory textbooks
pedagogical example in discrete mathematics courses
boardOrientation horizontal rows numbered relative to starting line
boardSymmetry translation-invariant in horizontal directions
boardType infinite rectangular grid
category Conway’s games
constraint only finitely many moves may be played in any actual play sequence
creatorAffiliation University of Cambridge (at time of Conway’s work in combinatorial games)
demonstrates that local improvements can be globally bounded
field combinatorial game theory
recreational mathematics
goal advance a piece as far as possible above the starting line
hasNameOrigin named after John Horton Conway
initialConfiguration all squares above the starting horizontal line are empty
all squares on or below a given horizontal line are occupied
inventor John H. Conway
surface form: John Horton Conway
keyResult no sequence of legal moves can move a piece more than four rows above the starting line
the fifth row above the starting line is unreachable with only orthogonal jumps
logicalStatus mathematically solved in the standard formulation
movementRule a move consists of jumping over an adjacent piece into an empty square and removing the jumped piece
diagonal jumps are not allowed in the standard version
pieces move by orthogonal jumps over adjacent pieces
notableFeature illustrates sharp boundary between reachable and unreachable positions
simple rules with nontrivial global constraint
objectiveType reachability maximization
pieceType identical checkers-like pieces
proofMethod invariant based on weights assigned to board positions
potential function argument
puzzleType deterministic perfect-information puzzle
relatedConcept checkers
invariants in combinatorial games
monovariants
peg solitaire
resultForVariant allowing diagonal moves increases the maximum reachable row
solutionStatus exact maximum height known for standard orthogonal version
teaches limitations of local move rules on global reachability
use of invariants to prove impossibility results
uses infinite checkerboard grid
usesTool geometric series in potential function construction
variant Conway’s soldiers self-linksurface differs
surface form: Conway’s soldiers on different lattices

Conway’s soldiers self-linksurface differs
surface form: Conway’s soldiers with diagonal moves

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Referenced by (4)

Full triples — surface form annotated when it differs from this entity's canonical label.

Horton notableWork Conway’s soldiers
subject surface form: John Horton Conway
John hasConcept Conway’s soldiers
subject surface form: John H. Conway
this entity surface form: Conway's soldiers
Conway’s soldiers variant Conway’s soldiers self-linksurface differs
this entity surface form: Conway’s soldiers with diagonal moves
Conway’s soldiers variant Conway’s soldiers self-linksurface differs
this entity surface form: Conway’s soldiers on different lattices