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Paper Abstract and Keywords
Presentation 2026-05-23 10:15
Explanation of Action Selection in Three-Player Rummy Based on a Social Value Model
Takafumi Sakamoto (Shizuoka Univ.) HCS2026-18 HIP2026-18
Abstract (in Japanese) (See Japanese page) 
(in English) Agents acting on behalf of humans must choose actions while coordinating with others, and must be able to provide understandable explanations for their choices. In this study, we target a three-player cooperative rummy-like card game and build a social-value model that decomposes a player's preference over a card into three components: a self-value, an other-consideration value (care for cards the opponents appear to want), and an information-gap value (exploitation of the divergence between one's own valuation and the valuation the opponents are assumed to infer). Three information conditions S, SO, and SOL are defined according to which components are used. We optimize the parameters of each condition with a co-evolutionary genetic algorithm and compare the cooperative performance of the resulting agent populations. A large language model then generates natural-language explanations of action choices both per turn and after the match. The explanations are evaluated in an event-based manner against objective card-flow indicators (direct relays, reaching the winner's hand, and constituting the winner's meld). The results show that the fraction of well-grounded explanations and the fraction of over-claims change markedly with the combination of the information supplied to the language model and the information condition of the agents.
Keyword (in Japanese) (See Japanese page) 
(in English) Social value / Rummy-like game / Genetic algorithm / 大規模言語モデル / 説明可能性 / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 38, HCS2026-18, pp. 89-94, May 2026.
Paper # HCS2026-18 
Date of Issue 2026-05-15 (HCS, HIP) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF HCS2026-18 HIP2026-18

Conference Information
Committee HIP HCS HI-SIGCOASTER  
Conference Date 2026-05-22 - 2026-05-23 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawa Industry Support Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Communication Enhancing, Human Communications, and Human Information Processing 
Paper Information
Registration To HCS 
Conference Code 2026-05-HIP-HCS-SIGCOASTER 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Explanation of Action Selection in Three-Player Rummy Based on a Social Value Model 
Sub Title (in English)  
Keyword(1) Social value  
Keyword(2) Rummy-like game  
Keyword(3) Genetic algorithm  
Keyword(4) 大規模言語モデル  
Keyword(5) 説明可能性  
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1st Author's Name Takafumi Sakamoto  
1st Author's Affiliation Shizuoka University (Shizuoka Univ.)
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Speaker Author-1 
Date Time 2026-05-23 10:15:00 
Presentation Time 20 minutes 
Registration for HCS 
Paper # HCS2026-18, HIP2026-18 
Volume (vol) vol.126 
Number (no) no.38(HCS), no.39(HIP) 
Page pp.89-94 
#Pages 6 
Date of Issue 2026-05-15 (HCS, HIP) 

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