Simplify the following text for a Grade 9 native English-speaking person.
Original: Chess is played on a square board of eight rows ( called ranks and denoted with numbers 1 to 8 ) and eight columns ( called files and denoted with letters a to h ) of squares .
Simplified: Chess is played on a square board divided into eight rows of squares called ranks and eight columns called files , with a dark square in each player 's lower left corner .