Kaissa is the eastern European spelling of Caissa the goddess (muse) of chess. Taken from a poem by Sir William Jones in 1763. Based on Vida's 'Scacchia ludus', in which the nymph is referred to as 'Scacchis'. Mars asks the god of sport to invent a game that will soften the nymphs heart.
"A lovely Dryad ranged the Thracian wild, Her air enchanting, and her aspect mild. To chase the bounding hart was all her joy, Adverse from Hymen and the Cyprian boy. O'er hills and valleys was her beauty famed, And fair Caissa was the damsel named".
**Kaissa was also the name of the first Russian chess computer.