The strategy is to get the largest tile in a lower corner, with the next biggest tile next to it, and then the next, across the bottom. Once you have the bottom row filled, concentrate on putting tiles into the next row which will match the ones on the bottom row. Initially, when the tiles on the bottom row aren't that big, you should concentrate on matching the biggest tile. But as that becomes too large, concentrate on matching the next biggest, then the next, and so on. Of course as soon as you do match a tile on the bottom, merge with it so the bottom row always contains the biggest possible value. This strategy ought to get you to 2048 within 3 tries if you don't make too many mistakes.
I remember watching this AI play and thinking if I could write my own strategy into an AI. The AI's strategy suffers from the issues that my strategy tries to combat. Perhaps someone can tell from my screenshot what my strategy is.
To be honest, screenshots of this game are no longer a proof of anything. I am not calling you dishonest,but just saying that I could run the AI version, and when it wins change the address at the top,and using any browser's inspect feature just remove the two buttons above the game field. It's just ridiculously easy to fake winning screenshots of 2048 now.
Your strategy? Up and to the left. aka keep all the empty spaces next to the lowest number tiles.
The way I beat the AI was to try to give them isolated 2s on the opposite sides of the board and then flood the board with 4s. This prevented the AI from keeping all the low numbers together and blocked some tiles from use (the ones with the isolated 2s).
