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# possible or impossible?

• #141

Tantale said not to post the answer so don't post the answer!

Special thanks to Tantale!

• #142

Yes, it's a "trick" puzzle :P

I will post the solution to my own puzzle:

• #143

Regarding puzzle 3#, any further progress on that one?

Switching the rooks isn't easy. For this particular maneuver, you need to find a way to block the white rook from checking the black king. But how can this be done? does white have any piece that can interfere with that check?

• #144

I give up. No use posting half-hearted solutions. I  guess its ur turn shoopi...

• #145

Alright. The really tricky trick is to use the white king in order to switch up the rooks - white rook getting to e2 (you need the white king to prevent the rook from checking the black king), then the black rook gets behind it, then the white rook gets back and viola! the switch is complete. Proof game below (watch move 51 onward for the critical maneuver):

• #146

New positions coming up.

First one is a composition by einstein_69101, second one is a composition by myself. Possible or impossible?

• #147

Second one is impossible. How could 2 rooks be on the 1st rank adjacent?

• #148

Yeah, but that's not the final position expressed in the puzzle originally, so still impossible.

• #149

Puzzle 2 is indeed impossible see position below

After Black plays gxh2 in that setup (the only way to get a promoted Rook on g1, White is stuck: no pawns can be pushed to alter the position and the remaining piece is pinned. Now bite me and prove me wrong as always

• #150
Fralnp wrote:

Puzzle 2 is indeed impossible see position below

After Black plays gxh2 in that setup (the only way to get a promoted Rook on g1, White is stuck: no pawns can be pushed to alter the position and the remaining piece is pinned. Now bite me and prove me wrong as always

Hm... What if there was another knight on f1, like this:

White won't ever get stuck,  as before that sequence, he can just shuffle around the 'extra' knight.
• #151

Yes but in order for the c7-pawn to reach h2 White had to sacrifice 5 mens (excluding Bishops since they could never get out of that pawn formation), two Rooks, a Queen, a Knight and the h-pawn. I would liked a scenario like this however...

• #152

The first position in #151 is possible:

• #153
shoopi wrote:

and viola! the switch is complete.

• #154
s0030135 wrote:

The first position in #151 is possible:

Correct, solved!

Still awaiting sentence for the second puzzle... good luck.

• #155
[COMMENT DELETED]
• #156

The second position is also possible:

• #157
edit: someone got it before me :(
• #158

Congratulations to both of you!

More positions coming up.

which of these positions is legal? (composed by cobra91):

• #159

here's another one, black can still castle on both sides but that doesn't really matter

• #160

is it too hard or is it too easy that nobody wants to answer?

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