Keres opening for white and black about a 33.60 percentage for win for white and 27.83 percentage for black. It has been known as favors of many grandmasters like Karpov.
My favorite viaration is the Keres Attack. The base of Keres is like the base of the Yogoslav and the Dragon. White pushes the kingside before 0-0. Not like other Scheveningen viariants the push kingside after 0-0. Then white must castle queenside and black has a choice of not castling or castling in the queenside.
| bRa8 b8 bBc8 bQd8 bKe8 bBf8 bNg8 bRh8 |
| bPa7 bPb7 c7 bPd7 e7 bPf7 bPg7 bPh7 |
| a6 b6 bNc6 d6 bPe6 f6 g6 h6 |
| a5 b5 c5 d5 e5 f5 g5 h5 |
| a4 b4 c4 wNd4 wPe4 f4 g4 h4 |
| a3 b3 c3 d3 e3 f3 g3 h3 |
| wPa2 wPb2 wPc2 d2 e2 wPf2 wPg2 wPh2 |
| wRa1 wNb1 wBc1 wQd1 wKe1 wBf1 g1 wRh1 |
An old saying about the Scheveningen is If you want to stay calm you kiss your queenside good bye if you don't want to kiss your queenside goodbye you push the kingside if you push kingside you kiss your own king goodbye (for white).
Attack the kingside for compensention of the pawn sacrafice.
There are many other unknown viariations of this opening so try to find them all and try to invent something.