Since the first win, I have played hundred of games against level 4. Stockfish mostly won, but I was able steal 5 wins and several draws.
Wins
https://kleb.3dgraphingcalculator.org/game/JhSRvkF6olWM
https://kleb.3dgraphingcalculator.org/game/V2LJvZunBCyU
https://kleb.3dgraphingcalculator.org/game/OLsFLve5aHDT
https://kleb.3dgraphingcalculator.org/game/kwG2uIjnpXnP
https://kleb.3dgraphingcalculator.org/game/kFXjN3nQ20q0
Draws
https://kleb.3dgraphingcalculator.org/game/8ME6lC8tZRHE
https://kleb.3dgraphingcalculator.org/game/LfgaHBSryQ9d
https://kleb.3dgraphingcalculator.org/game/CgTiupqBJ1AC
https://kleb.3dgraphingcalculator.org/game/fbxqAtULzWmg
https://kleb.3dgraphingcalculator.org/game/gYPNSB5Va1LZ
https://kleb.3dgraphingcalculator.org/game/tDxIE00l9hZbIt seems I need more time before trying level 5.
Since the first win, I have played hundred of games against level 4. Stockfish mostly won, but I was able steal 5 wins and several draws.
Wins
https://kleb.3dgraphingcalculator.org/game/JhSRvkF6olWM
https://kleb.3dgraphingcalculator.org/game/V2LJvZunBCyU
https://kleb.3dgraphingcalculator.org/game/OLsFLve5aHDT
https://kleb.3dgraphingcalculator.org/game/kwG2uIjnpXnP
https://kleb.3dgraphingcalculator.org/game/kFXjN3nQ20q0
Draws
https://kleb.3dgraphingcalculator.org/game/8ME6lC8tZRHE
https://kleb.3dgraphingcalculator.org/game/LfgaHBSryQ9d
https://kleb.3dgraphingcalculator.org/game/CgTiupqBJ1AC
https://kleb.3dgraphingcalculator.org/game/fbxqAtULzWmg
https://kleb.3dgraphingcalculator.org/game/gYPNSB5Va1LZ
https://kleb.3dgraphingcalculator.org/game/tDxIE00l9hZb
It seems I need more time before trying level 5.