300 checkmate puzzles!! (puzzles 20 - 38)

These are fun.  I thank you for taking the time to post them!

Hi I just found an error in one of the secondairy solutions of puzzel 11.

the red solution reads 1. Re7+ Kh8  2. Qg8  and I belive that is an error, since it lets black with the option of 2... Kxg8 wich defuses the whole situation and white loses it's pressure position. now 3.Rxe8 triggers 3... Qf8 and white is now facing loss of material since he can no longer put forced moves on Black and his best pieces are not protected.

I would change the red solution to this. 1. Re7+ Kh8  2. Nf7+ Kg8 (his only option) 3.Nxd6+ with now 2 options, first option 3... Kh8 4.Rxe8#  second option 3... Kf8 4.Qf7#

 Edit: I just noticed, only the original solution 1. Rf8+ leads to a certainty of victory, the alternate solution 1.Re7+  lets Black counter with 1... Be6 getting his Bishop into play and opening up his backline for double Rook's, this move puts him on the attack and in a stronger position then white wich is now facing some serious material loss.

this move with the bishop can also be used as a third option in my alternate red solution above after 3. Nxd6+. here 3... Be6 also works wonders for removing the chanses for white to win anytime soon. this little move apears to be the key for black to regain control of the game, but only works if white does not start off with 1.Rf8+

TripleXDooM thanks a lot

In puzzle 11 alternative solution,after Qg8,black can take with king

Please don't - I hate upside down boards, especially if the wobble up and down every move. Just make them White to play instead, then everyone will be happy.

ferdig mann for søren

Playing with the upside-down board helps you calculate what your opponent can do in response, really helpful in critical calculation positions.

TripleXDooM - Thank You so much for these puzzles considering that Im a free acc

These are kewl because you added the variations !

6. Qh1# right?

On 16, you can do Nxa7++ on your first move for a quicker checkmate. 

The exercices are in start position to me. Someone has the solution?

they don't work, why? the first page wrked....

Definitely borked but I guess the OP is no longer here?