Original Problems (85)

I’m so much happy to present 2 problems by Petko A. Petkov! My site will become half-year old on October, the 10th. Also, a year ago on the same day, I’ve written to Mr.Petkov for the first time and from that day trying to be a good student of him. These problems is one of the most meaningful gifts I ever had!   

Dear Petko, thank you so much for everything!!!

No.148 – hs#3 – White blocks realized by the black pieces!  – a very surprising  effect of Anti-Andernach Chess! (Author)

No.149 – hs#3 – A non-standard change of functions of two Chameleons, where “tempo moves of Chameleons have an effect as white block through the black piece” (JV)

Definitions:

Chameleon: On completing a move, a Chameleon (from classical standard type) changes into another piece, in the sequence Q-S-B-R-Q…  Promotion may be to a chameleon at any stage in the cycle.

Nightrider(N): A Rider along a straight line on squares lying a Knight`s move away from each other.

Anti-Andernach Chess: a unit (not King) changes color after its moves unless that move is a capture. (Or: a unit (King excluded) changes color on completion of a non-capturing move.) 

You can сlick on “Solutions” to show or hide the solutions!

No.148 Petko A. Petkov Bulgaria original-09.10.2012 Dedicated to Julia Vysotska!   hs#3              2 solutions            (5+6) Anti-Andernach Nightrider e6   Solutions: (click to show/hide)   I. 1.Nd8 =bN Kf4 2.Ra8 =bR Qg7 =wQ!! 3.Qxb4+ Nxb4# (not possible 4.Qg8=b.Q – self-check!) II. 1.Nd4 =bN Kh3 2.Qa1=bQ Qg8=qQ!! 3.Rxf3+ Nxf3# (not possible 4.Qg7=b.Q – self-check!)   Creation of black batteries N/R N/Q through white moves(!) with interchange of functions between Ra3/Qe1. But most interesting theme here is “White blocks realized by the black pieces!” – a very surprising  effect of Anti-Andernach Chess!  Paradoxical thing here is that in the initial setting the black Queen keeps all squares around the w.King, but this piece should eliminate this  domination and execute a specific block-functions. Model mates in Meredith form! (Author)

No.149 Petko A. Petkov Bulgaria original-09.10.2012 Dedicated to the 6th month Jubilee of the site Julia’s Fairies!   hs#3              2 solutions            (6+6) Anti-Andernach Chameleons: Sa5, Qd8, Qg3   Solutions: (click to show/hide)   I. 1.CQg8 =bCS! CQg5 =wCS  2.CSh7 =bCB  CSb7 =wCB!!  – tempo-move!! 3.Sxg8+ CBxg8 =CR#. Impossible is 4.CBc8=bCR?? – self-check! II. 1.CQd4=bCS!  CSc6 =wCB  2.CBd7=bCR CQb8 =wCS!!  – tempo-move!! 3.Sxd5+ CRxd5 =CQ#.  Impossible is 4.CSc6=bCB?? – self-check!   The surprising destruction of the white  strong battery S/CQ leads to two sacrifices of the  rear piece (CQ) on g8/d5. There are no black batteries here, but the black Chameleons (CQ and CS) demonstrate a non-standard change of functions – if  one Chameleon mates,  the other – executes a tempo move which has an effect as white block through the black piece! Model mates in Meredith form.(Author)

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