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We study impartial take away games on 2 unordered piles of finite nonnegative numbers of tokens $(x,y)$. Two players alternate in removing at least one and at most all tokens from the respective piles, according to certain rules, and the…

Combinatorics · Mathematics 2012-06-21 Urban Larsson

Wythoff's Nim is a variant of 2-pile Nim in which players are allowed to take any positive number of stones from pile 1, or any positive number of stones from pile 2, or the same positive number from both piles. The player who makes the…

Combinatorics · Mathematics 2024-08-08 Mirabel Hu , Daniel Sleator , William Tsin

Wythoff's Game is a variation of Nim in which players may take an equal number of stones from each pile or make valid Nim moves. W. A. Wythoff proved that the set of P-Positions (losing position), $C$, for Wythoff's Game is given by $C :=…

Combinatorics · Mathematics 2017-02-16 Shubham Aggarwal , Jared Geller , Shuvom Sadhuka , Max Yu

We introduce a new generalization of Wythoff Nim using three piles of stones. We show that its P-positions have finite difference properties and produce a partition of positive integers. Further, we give a conjecture that the P-positions…

Combinatorics · Mathematics 2024-12-25 Shigeki Akiyama

The 2-player impartial game of Wythoff Nim is played on two piles of tokens. A move consists in removing any number of tokens from precisely one of the piles or the same number of tokens from both piles. The winner is the player who removes…

Combinatorics · Mathematics 2010-10-29 Urban Larsson

Wythoff's Game is a game for two players playing alternately on two stacks of tiles. On her turn, a player can either remove a positive number of tiles from one stack, or remove an equal positive number of tiles from both stacks. The last…

Combinatorics · Mathematics 2016-06-23 Alex Meadows , Brad Putman

We study 2-player impartial games, so called \emph{invariant subtraction games}, of the type, given a set of allowed moves the players take turn in moving one single piece on a large Chess board towards the position $\boldsymbol 0$. Here,…

Combinatorics · Mathematics 2010-09-23 Urban Larsson

The authors introduce the impartial game of the generalized Ry\=u\=o Nim, a variant of the classical game of Wythoff Nim. In the latter game, two players take turns in moving a single queen on a large chessboard, attempting to be the first…

Combinatorics · Mathematics 2017-11-07 Ryohei Miyadera , Yuki Tokuni , Yushi Nakaya , Masanori Fukui , Tomoaki Abuku , Koki Suetsugu

We introduce a variant of Wythoff's Game that we call $m$-Modular Wythoff's Game. In the original Wythoff's Game, players can take a positive number of tokens from one pile, or they can take a positive number of tokens from both piles if…

Combinatorics · Mathematics 2024-02-22 Tanya Khovanova , Shuheng Niu

In this paper, we study a variant of the classical Wythoff's game. The classical form is played with two piles of stones, from which two players take turns to remove stones from one or both piles. When removing stones from both piles, an…

Combinatorics · Mathematics 2026-05-04 Kahori Komaki , Ryohei Miyadera , Aoi Murakami

We study a variation of the combinatorial game of 2-pile Nim. Move as in 2-pile Nim but with the following constraint: Suppose the previous player has just removed say $x>0$ tokens from the shorter pile (either pile in case they have the…

Combinatorics · Mathematics 2009-06-02 Urban Larsson

We give short rules for two-pile take-away games satisfying that a pair of complementary homogeneous Beatty sequences together with $(0,0)$ constitute a complete set of $P$-positions.

Combinatorics · Mathematics 2011-03-21 Urban Larsson

We study a variant of the classical Wythoff's game. The classical form is played with two piles of stones, from which two players take turns to remove stones from one or both piles. When removing stones from both piles, an equal number must…

Combinatorics · Mathematics 2026-05-05 Kahori Komaki , Ryohei Miyadera , Aoi Murakami

We introduce a restriction of Wythoff's game, which we call F-Wythoff, in which the integer ratio of entries must not change if an equal number of tokens are removed from both piles. We show that P-positions of F-Wythoff are exactly those…

Combinatorics · Mathematics 2012-03-26 Nhan Bao Ho

Yama Nim is a two heaps Nim game introduced in the second author's Master Thesis, where the player takes more than $2$ tokens from one heap, and return $1$ token to the other heap. Triangular Nim is a generalization, where the player takes…

Combinatorics · Mathematics 2023-10-11 Shun-ichi Kimura , Takahiro Yamashita

We study the problem whether there exist variants of {\sc Wythoff}'s game whose $\P$-positions, except for a finite number, are obtained from those of {\sc Wythoff}'s game by adding a constant $k$ to each $\P$-position. We solve this…

Combinatorics · Mathematics 2014-03-12 Aviezri S. Fraenkel , Nhan Bao Ho

We present two variants of Wythoff's game. The first game is a restriction of Wythoff's game in which removing tokens from the smaller pile is not allowed if the two entries are not equal. The second game is an extension of Wythoff's game…

Combinatorics · Mathematics 2012-03-12 Nhan Bao Ho

We consider a subtraction Nim with subtraction set {s_1,s_2,s_3={2,4n,4n+2}, where n is a positive integer such that n >= 3. We do not treat the case that n=1 or n=2 in this article. We show that this game satisfies the reverse-mex property…

Combinatorics · Mathematics 2026-05-15 Urban Larsson , Hikaru Manabe , Ryohei Miyadera

We modify Wythoff's game by allowing an additional move, which we call a "split", and show how the $P$-positions are coded by the Tribonacci word. We analyze the table of letter positions of arbitrary $k$-bonacci words and find a…

Combinatorics · Mathematics 2019-11-19 Robbert Fokkink , Dan Rust

This paper describes Wythoff's game with a pass, which is a variant of the classical Wythoff's game. The classical form is played with two piles of stones, from which two players take turns to remove stones from one or both piles. When…

Combinatorics · Mathematics 2025-07-08 Ryohei Miyadera , Hikaru Manabe , Masanori Fukui
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