See this move? This Bb5? People keep playing it in blitz.
Don’t play it.
It’s a very bad move. (Or else it’s good in such a sophisticated way that most of us won’t be able to follow through on the ideas.)
Here’s why it’s so bad.
Look at the pawn structure. The pawn structure dictates what plan each player must use in the next phase of the game.
White has a central pawn chain that gives him more space, and particularly freedom to maneuver on the kingside. If Black castles short, White is likely to make a good attack. That’s White’s most obvious plan.
Black wants to undermine that pawn chain, blow it up, liquidate it to free his pieces. The current base of the pawn chain is d4. So Black will attack d4. Thus has it ever been in the French defense. His most critical way of doing that is by attacking it with a pawn (…c5) and threatening to capture. That’s Black’s most obvious plan.
So what happens after this bad Bb5 move is that Black plays …Nc6, and White typically plays Bxc6 . (What else would the bishop be doing out there? Its ability pin something to the Black king is very short-lived as Black will play …Be7 and …0-0. Either you trade it or you just completely wasted a tempo by putting it there.) Black will respond …bxc6.
Now look at the new position. What piece would have been really useful in White’s kingside attack? A killer bishop sitting on d3, scoping the g6 and h7 squares. And what again is the key to Black’s counterattack on the center? The c-pawn.
By playing Bxc6, in one fell swoop you have tossed overboard one of your best attacking pieces and also given Black AN EXTRA C-PAWN. So he’ll trade on d4 and then get to play …c5 AGAIN! Your ability to execute your plan is weakened and Black’s ability to execute his plan is strengthened.
Do not do. Many failpoints.