SOS – Secrets of Opening Surprises 13 is out!

Good news for thousands of chess players all over the world, who will be eagerly hunting its pages for early deviations from main stream chess openings.

Because SOS is for chess players who like to get an early advantage in the game by throwing their opponent off balance and gaining valuable time on the clock.

With SOS not only will you score some unexpected victories, you also have a chance to win €250 for your best game played with an SOS variation.

Please, have a look at the variations covered in SOS 13.