K - Germany - Impact of chess training on mathematics performance and concentration ability of children with learning disabilities. Markus Scholz et al, (2008). “Impact of chess training on mathematics performance and concentration ability of children with learning disabilities.” International Journal Of Special Education Vol 23 No 3 2008. This study offered children with learning difficulties a 1-year package of chess lessons in school. These children showed a significant improvement in simple addition and counting tasks compared with a control group. Manage Cookie Preferences