Upgrade Peshk@ to Multiplatform

Upgrade Chess Tactics Level 2 to Multiplatform 5x
Levels 3 - 4 [Rating 1000-1400]; Tactics. Over 750 tactical exercises.

Upgrade Checkmates II to Multiplatform 5x
Level 2 [Rating 600-1000]<br /> Tactics, School Software. 77,000 mate in one exercises for beginners.

Upgrade Chess Tactics Level 1 to Multiplatform 5x
Levels 1 - 2 [Rating 200-1000]; Tactics. 570 tactical exercises classified by theme and difficulty ensure variety and a good understanding of basic tactics.

Upgrade Checkmates I to Multiplatform 5x
Level 1 [Rating 200-600]; Tactics, School Software. 40,000 exercises on elementary checkmates.