There is a new release for the Army Trait document. The only alteration is for Chequerboard. Added is the following –
While qualified for chequerboard, those adjacent files that have corner-to-corner contact count as being in partial side edge contact for ‘shove’ & ‘shatter’ purposes.
This applies to both the charge phase and fighting phase. This is to stop pike and shot with shove being penalised by being in Chequerboard