Hikaru no Go, 3-gatsu no Lion Recommendations
If you were able to watch and enjoy Hikaru no Go you will probably like 3-gatsu no Lion as well. Both are about characters trying to be / become professional board game players so the style is similar, because you get to see the gameplays. In my opinion watching Hikaru matches was more interesting, while in 3-gatsu the life of the player in general is more developed and perhaps more troubled. But overall both very nice shows.
Both of those games are stopped when someone admit their lost, creating interesting situations.
Other than that they are quite different in tones.
About a young boy learning to play a board game. Much longer and not so much about his inner struggles, but an excellent show nonetheless.
Both about a boy playing a board game. Hikaru no Go is more match focused than 3-gatsu no Lion and 3-gatsu no Lion is more focoused on the personal struggles and mindset of the main character. However, they both have these two aspects, and are very good emotionally charged anime about chracters growing up alongside a board game.