So, it's Larsen's Opening (not a Nimzo-Larsen) turned into a King's Indian Attack, the double fianchetto version. Black plays Lasker's New York System, a Black/reversed London System. These structures have long generated dynamic play against one another. Here's some examples of Bb2 vs Bf5: Larsen vs Saemisch, 1969 and Reti vs Lasker, 1924 and Reti vs Lasker, 1924 and Smyslov vs Keres, 1951 Note: Lasker never faced 1.b3 in this database. Here is a similar structure w/colors reversed, a White London System Bf4 against the Black fianchetto Bb7: Reti vs Alekhine, 1924 and: Capablanca vs Reti, 1922 and Lasker vs Alekhine, 1924

Black impatiently tosses out 7...a5?!, 8...a4?! and 9...c5?! before developing the other half of his minor pieces. It gives Black a worse position, but it is dynamic. It's better to place one's pieces on proper squares before flinging pawns at the enemy. The ties and pins that evolved as a result of extended pawns, weak squares, and kings in the center certainly dictated the action.

After 23...Kd6, it takes another eighteen moves before removing White's d-pawn with 41...Kxd5. Both colors have to be especially careful with an opposing knight lurking so close to their advancing king. I find such games timer and emotionally draining, as it's easy to slip and fall with an alternating color complex. One must have complete focus on the possibilities of the opposing knight without letting up. The White knight was quite effective in this endgame.