By saying that the spellchecker in this forum did not "like" the spelling 'checquer', I was anthropomorphizing it.Since you seem incapable of understanding the concept of personification of nonhuman entities, I will rephrase it.
The spellchecker in this forum indicates that it does not find the spelling of the word "checquer" to be acceptable, by placing a squiggly red line beneath it. It does accept the spelling "checker", as it does not place a squiggly red line beneath the word when spelled in the latter fashion.
I trust that this meets with the abilities of your intellect.
My cat seems to find this simplification adequate.