To gain insight into human nature philosophers often discuss the inferior performance that results from deficits such as blindsight or amnesia. Less often do they look at superior abilities. A notable exception is Herbert Dreyfus who has developed a theory of expertise according to which expert action generally proceeds automatically and unreflectively. We address one of Dreyfus's primary examples of expertise: chess. At first glance, chess would seem an obvious counterexample to Dreyfus's view since, clearly, chess experts are engaged in deep strategic thought. However, Dreyfus's argument is subtle. He accepts that analysis and deliberation play a role in chess, yet he thinks that all such thought is predicated on intuitive, arational expert perception, and action. We argue that even the so-called "intuitive" aspect of chess is rational through and through.

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We present a position in infinite chess exhibiting an ordinal game value of ω 4 , thereby improving on the previously largest-known values of ω 3 and ω 3 • 4.

Introduction: There is a dearth of data on professional fighters, particularly in mixed martial arts. Thus, this investigation aimed to describe the body composition variables of male and female professional fighters. Methods:  A total of 28 professional fighters participated in this investigation (n=22 male, n=6 female). The majority (68%) of the fighters competed in the Ultimate Fighting Championship (UFC) (n=19). The remaining fighters competed in various other promotions (e.g., WBO, IBF, UFC, Bellator, Eagle FC, Invicta.). Body composition was assessed via dual-energy x-ray absorptiometry (DXA). Total and regional body composition was determined.  Results: There were significant sex differences for Height: Male 180.3 ± 6.7 cm, Female 164.3 ± 6.8 cm (P < .001); Body mass: Male 86.5 ± 11.5 kg, Female 63.3 ± 4.9 kg (P < .001), lean body mass: Male 12.7 ± 2.7 kg, Female 46.7 ± 3.9 kg (P < .001), whole body bone mineral density: Male 1.53 ± 0.13 g/cm2, Female 1.26 ± 0.10 g/cm2 (P < .001), Z-score: Male 2.57 ± 0.88, Female 1.68 ± 1.06 (P < .05), regional bone mineral density (except for the head), regional percent fat (except for the head), and percent body fat; however, no differences were found for age or whole-body fat mass. In males, there was a significant relationship between body mass and lean mass with bone mineral density (p < 0.005, R2 = 0.357). Furthermore, there existed within-sex differences for male fighters. Male fighters' percent fat was significantly different when comparing their left vs. right sides for both the upper and lower extremities. Conclusions: It is evident that profound sex differences exist vis a vis body composition in professional fighters. It should be noted that bone mineral density is exceedingly high in this group of athletes. Furthermore, there tends to be asymmetry in the percent fat of the extremities in male fighters.

A common problem for people with disabilities, particularly those who rely on mobility devices, is learning to navigate a new environment. This is especially troublesome for students who are attending a new university and need to figure out how to get from one place to another. All Together Now is a mobile multi-player cooperative game developed for two purposes. First, the game, developed by two computer scientists and a disability studies scholar, is intended to give disabled students a fun way to learn their way around campus, learn how to report accessibility issues on that campus, and make friends with people who have similar disabilities. Second, the game can be used as a way of fostering awareness and advocacy among students without disabilities, by having them work in teams where one member is someone with a disability that causes them to rely on mobility devices. This article describes the implementation of the game within a disability studies course and the results of two pilot tests, with both disabled and non-disabled participants.

A common problem for people with disabilities, particularly those who rely on mobility devices, is learning to navigate a new environment. This is especially troublesome for students who are attending a new university and need to figure out how to get from one place to another. All Together Now is a mobile multi-player cooperative game developed for two purposes. First, the game, developed by two computer scientists and a disability studies scholar, is intended to give disabled students a fun way to learn their way around campus, learn how to report accessibility issues on that campus, and make friends with people who have similar disabilities. Second, the game can be used as a way of fostering awareness and advocacy among students without disabilities, by having them work in teams where one member is someone with a disability that causes them to rely on mobility devices. This article describes the implementation of the game within a disability studies course and the results of two pilot tests, with both disabled and non-disabled participants.

We investigate the transfinite game values arising in infinite chess, providing both upper and lower bounds on the supremum of these values-the omega one of chessdenoted by ω Ch 1 in the context of finite positions only and by ω Ch ∼ 1 in the context of all positions, including those with infinitely many pieces. For lower bounds to ω Ch ∼ 1 , we present specific positions with transfinite game values of ω, ω 2 , ω 2 • k and ω 3 .By embedding trees into chess, we show that there is a computable infinite chess position that is a win for white if the players are required to play according to a deterministic computable strategy, but which is a draw without that restriction. Finally, we prove that every countable ordinal arises as the game value of a position in infinite three-dimensional chess, and consequently the omega one of infinite threedimensional chess is as large as it can be, namely, ω