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The games symbolize the fight between God and the Devil, the good against evil to win souls.
The game represented is called the "alquerque" or Nine Men’s Morris and mill’s game in Spain.
Churches:
San Pedro de Perorrubio (Segovia), San Vicentejo de Triviño (Burgos), Santa María de Carracedo (León), Santa María Magdalena (Zamora), San Miguel de Fuentidueña (Segovia), San Pedro de Gaillos (Segovia). San Martín de Frómista (Palencia), San Miguel de Esteban de Gormaz (Soria).
Read more in The stonemason’s signs in the Romanesque churches in Spain.