The odd opening position

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Standard opening variations of well-known openings are shown below. Can you name both the opening and the variation? All positions except one share a common characteristic. Can you spot the odd position out? Hint: the common characteristic is mathematical in its nature.

[Congratulations to Rooperi and Checkmateisnear for solving the main question; all positions except VII show the board after white's 10th move. VII shows the board after white's 14th move.

All positions are now solved:

I.King's Indian:Saemisch; II.King's Gambit:Muzio Gambit; III.Sicilian:Pelikan/Shveshnikov;IV.Ruy Lopez:Schliemann; V.Dutch:Leningrad;VI.Benoni:Taimanov;VII.French:Winawer;VIII.Queen's Gambit Declined: Lasker;IX.Sicilian:O'Kelly;X.Ruy Lopez:Cozio;XI.King's Gambit: Allgaier;XII.Vienna: Frankenstein-Dracula]

Avatar of rooperi

XII is the Vienna: Frankenstein-Dracula

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III is the Sicilian: Pelikan

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rooperi wrote:

XII is the Vienna: Frankenstein-Dracula


 I knew you'd get this one!

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rooperi wrote:

III is the Sicilian: Pelikan


 Yes!

Avatar of zankfrappa

Wow!  I thought with the full boards instead of sections I would do better at
this puzzle but I guess not as this is difficult as well.

Avatar of krish40

ii is the kings gambit

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II is a KG, maybe Muzio gambit?

Avatar of mkchan2951

VII is french winawer right? and IX is sicilian maroczy bind

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krish40 wrote:

ii is the kings gambit


 Correct, and Rooperi identifies it correctly as Muzio.

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manikcharan wrote:

VII is french winawer right? and IX is sicilian maroczy bind


 Winawer is correct, but for IX even though it shows a Maroczy bind structure, I am looking for a specific variation...

Avatar of mkchan2951

II is actually the KG wild muzio

Avatar of Golbat

I. King's Indian: Exchange Variation

II. King's Gambit: Double Muzio

III. Sicilian: Pelikan Variation

IV. (Some 1. e4 line)

V. (Some Dutch line)

VI. King's Indian: Four Pawns Attack

VII. French Defense: Winawer Poisoned Pawn

VIII. Queen's Gambit Declined: Lasker Variation

IX. (Some English line)

X. I would guess Scotch: Four Knights?

XI. (Some King's Gambit line)

XII. Vienna: Frankenstein-Dracula Variation

Avatar of Crazychessplaya

BlackWaive correctly adds QGD Lasker to the solved pool...

Avatar of mkchan2951

hey IX can even be the pelikan sicilian

Avatar of Golbat

Oh, maybe VI was supposed to be Benoni: Four Pawns Attack.

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BlackWaive wrote:

Oh, maybe VI was supposed to be Benoni: Four Pawns Attack.


 Verrry close...

Avatar of mkchan2951

i got it schmidt variation benoni VI

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manikcharan wrote:

i got it schmidt variation benoni VI


 It is Benoni, but neither Schmidt nor Four Pawns...

Avatar of rooperi
manikcharan wrote:

i got it schmidt variation benoni VI


I was thinking that, but Black needs an e5 pawn?