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Kuhn poker

Description

Kuhn poker is a simplified poker with three cards: J, Q, and K.

Rules

Each player is dealt one card and the remaining card is unused. There are two actions: bet and pass and five possible scenarios.

  1. bet (1st) - bet (2nd) : Showdown and the winner takes +2
  2. bet (1st) - pass (2nd) : 1st player takes +1
  3. pass (1st) - pass (2nd) : Showdown and the winner takes +1
  4. pass (1st) - bet (2nd) - bet (1st) : Showdown and the winner takes +2
  5. pass (1st) - bet (2nd) - pass (1st) : 2nd takes +1

Specs

Name Value
Version v0
Number of players 2
Number of actions 2
Observation shape (7,)
Observation type bool
Rewards {-2, -1, +1, +2}

Observation

Index Description
[0] One if J in my hand
[1] One if Q in my hand
[2] One if K in my hand
[3] One if 0 chip is bet by me
[4] One if 1 chip is bet by me
[5] One if 0 chip of the opponent
[6] One if 1 chip of the opponent

Action

There are four distinct actions.

Action Index
Bet 0
Pass 1

Rewards

The winner takes +2 or +1 depending on the game payoff. As Kuhn poker is zero-sum game, the loser takes -2 or -1 respectively.

Termination

Follows the rules above.

Version History

  • v0 : Initial release (v1.0.0)