What number should replace the question mark?

if you like this kind of puzzles join us in "Online Chess School"

"Online Chess School" is group for players who their rate under 1700 and want to improve their ability by using a systematic method not a random practice, it's like a real chess school , there are chess course will be processed in a long term and there are chess puzzles and IQ puzzles.

the aim of this group is to help those who love chess and want to ameliorate but they can't pay for chess lessons, on the other hand, the aim is to have a small friendly international community know each other very well and be friends forever.

http://www.chess.com/groups/home/online-chess-school

Now we have just finished Lesson one , join us it's FREE

if your rate over 1700 and you like puzzles you are also welcomed

No chess games , No vote chess just chess lessons and puzzles

29 is a plausible answer. Maybe not the right one, but it does work

Sorry , the both answers are wrong

How do I sign up?

I'm going for 52.

sorry Simone  52 is wrong

 go this link http://www.chess.com/groups/home/online-chess-school  and join the group

 50?..is that correct..

The correct answer is 14. 

I put some studies here http://www.chess.com/groups/forumview/etuumltbase

and some combinations here and here: (and planning to update them every week)

http://www.chess.com/groups/forumview/mat-kombinezonlar

http://www.chess.com/groups/forumview/haftann-kombinezonlar

Unfortunately they're annotated in my native language, but it may be useful for whoever likes to solve this kind of stuff. Good luck with your newlyfound group BTW.

 i think the answer is 45

Is it 35?

Is't 32

1) 8+4+1=13 the perfect square nearest to 13 is 16 ... 13+16=29

2) 2+3+4=9  the perfect square nearest to 9 is 9 ... 9+9=18

3) 1+6+9=16 the perfect square nearest to is 16.... 16+16=32

45?

32! What does this have to do with chess though?

Accually there is only one of you find the correct answer?

who nominate himself?

52 works mathematically as a relation but you said it was wrong oh well ill explain it anyway if you subtract the perimeter triangles from the center you will get the second highest value squared

8,4,1--->29   29x29=841

3,2,4--->18    18x18=324

1,9,6--->?     ?x?=196 thus ?=14

14 it is then :-)

lol , that's right !!