fix integer overflow in correspondence games - fixes #278
fix integer overflow in correspondence games - fixes #278

JimmyMow/lila,danilovsergey/i-bur,JimmyMow/lila,samuel-soubeyran/lila,Happy0/lila,clarkerubber/lila,abougouffa/lila,r0k3/lila,bjhaid/lila,pawank/lila,elioair/lila,JimmyMow/lila,elioair/lila,luanlv/lila,danilovsergey/i-bur,clarkerubber/lila,systemovich/lila,Unihedro/lila,pavelo65/lila,pavelo65/lila,pawank/lila,Enigmahack/lila,r0k3/lila,pawank/lila,systemovich/lila,terokinnunen/lila,terokinnunen/lila,bjhaid/lila,abougouffa/lila,r0k3/lila,pawank/lila,Enigmahack/lila,Happy0/lila,TangentialAlan/lila,abougouffa/lila,Happy0/lila,Enigmahack/lila,r0k3/lila,bjhaid/lila,terokinnunen/lila,samuel-soubeyran/lila,elioair/lila,bjhaid/lila,arex1337/lila,pavelo65/lila,TangentialAlan/lila,systemovich/lila,JimmyMow/lila,TangentialAlan/lila,clarkerubber/lila,Enigmahack/lila,elioair/lila,pavelo65/lila,systemovich/lila,JimmyMow/lila,Happy0/lila,pawank/lila,Unihedro/lila,TangentialAlan/lila,ccampo133/lila,abougouffa/lila,samuel-soubeyran/lila,Happy0/lila,ccampo133/lila,clarkerubber/lila,bjhaid/lila,clarkerubber/lila,terokinnunen/lila,Unihedro/lila,arex1337/lila,samuel-soubeyran/lila,samuel-soubeyran/lila,Unihedro/lila,ccampo133/lila,danilovsergey/i-bur,abougouffa/lila,TangentialAlan/lila,pawank/lila,r0k3/lila,systemovich/lila,arex1337/lila,pavelo65/lila,pavelo65/lila,luanlv/lila,Happy0/lila,arex1337/lila,elioair/lila,Unihedro/lila,elioair/lila,samuel-soubeyran/lila,TangentialAlan/lila,danilovsergey/i-bur,Enigmahack/lila,luanlv/lila,luanlv/lila,arex1337/lila,ccampo133/lila,luanlv/lila,danilovsergey/i-bur,terokinnunen/lila,systemovich/lila,samuel-soubeyran/lila,ccampo133/lila,terokinnunen/lila,clarkerubber/lila,JimmyMow/lila,abougouffa/lila,Unihedro/lila,bjhaid/lila,Happy0/lila,pawank/lila,Unihedro/lila,luanlv/lila,Enigmahack/lila,ccampo133/lila,pavelo65/lila,r0k3/lila,danilovsergey/i-bur,luanlv/lila,systemovich/lila,abougouffa/lila,clarkerubber/lila,Enigmahack/lila,r0k3/lila,bjhaid/lila,danilovsergey/i-bur,ccampo133/lila,terokinnunen/lila,JimmyMow/lila,TangentialAlan/lila,elioair/lila,arex1337/lila,arex1337/lila