Which game is played on a marked board divided into two halves, each side containing 12 alternately colored points?

The game described, featuring a marked board divided into two halves, with each side containing 12 alternately colored points, is Backgammon. This classic two-player game is played on a board that is indeed split by a central divider, often called the "bar," creating two distinct sides. Each of these sides is further marked with 12 triangular spaces, known as "points" or "pips," which typically alternate in color. Players utilize two dice to strategically move their 15 pieces, or "checkers," around these 24 points, aiming to be the first to move all their pieces into their home board and then remove them from play.

Backgammon boasts a rich and ancient history, with its origins tracing back approximately 5,000 years to ancient Mesopotamia, in what is now modern-day Iraq. Early versions of the game were played by various civilizations, including the Romans, who had a similar game called "Tabula" or "Ludus Duodecim Scriptorum," and the Persians with their variant known as "Nard." Over centuries, the game evolved as it spread across different cultures, eventually taking on the form recognized today, with the earliest records of modern backgammon appearing in 17th-century England.

This enduring board game skillfully blends elements of both luck, determined by the roll of the dice, and strategic foresight. Players must make calculated decisions about moving their pieces, blocking opponents, and bearing off their own checkers efficiently. This combination of chance and skill has contributed to Backgammon's widespread and sustained popularity across the globe.