MESON Chess Problem Database

Problem Display
PID: 180339 (8/4p3/2B2P2/1Npp4/ppk5/b1p5/1nQP4/KR6 w - - 0 1)

Lider, Valentin Viktorovich

Europe Echecs, 1976

8/4p3/2B2P2/1Npp4/ppk5/b1p5/1nQP4/KR6

#2

7 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.d3#
    • 1...b3
      • 2.Qxc3#
  • Tries
    • 1.Sxa3+?
      • 1...bxa3
        • 2.Qxc3#
      • 1...Kd4!
    • 1.Rxb2?
      • threat
        • 2.d3#
      • 1...b3
        • 2.Qxc3#
      • 1...Bxb2+!
    • 1.fxe7?
      • 1...b3
        • 2.Qxc3#
      • 1...Sd1
        • 2.d3#
      • 1...d4
        • 2.Sd6#
      • 1...Sd3!
  • Keys
    • 1.dxc3!
      • 1...bxc3
        • 2.Qxc3#
      • 1...exf6
        • 2.Sd6#
      • 1...Sd3
        • 2.cxb4#
      • 1...Sd1
        • 2.Qe2#
      • 1...b3
        • 2.Sxa3#
      • 1...d4
        • 2.cxd4#
      • 1...e5
        • 2.Sd6#
      • 1...e6
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::P(D)
    • P(e);N_GUARD::QAR1(C),XP(c)
  • Tries
    • Try
      • S(E);CHECK,XB(b)
      • Vars
        • P(e);XS(E)::QAR1(C),XP(c)
      • Refutation
        • K(f);N_SPINP(c),P-FLIGHT
    • Try
      • R(B);XS(a)
      • Threat
        • P(D)
      • Vars
        • P(e);N_GUARD::QAR1(C),XP(c)
      • Refutation
        • B(b);CHECK,XR(B)
    • Try
      • P(G);XP(i)
      • Vars
        • P(e);N_GUARD::QAR1(C),XP(c)
        • S(a);N_GUARD::P(D)
        • P(h);SBLOCK::S(E)
      • Refutation
        • S(a);
  • Actual
    • P(D);XP(c)
    • Vars
      • P(e);OGATE,P_SPINP(e),XP(D)::QAR1(C),XP(e)
      • P(i);N_GUARD,XP(G)::S(E)
      • S(a);::QAR(C)+P(D),XP(e)
      • S(a);N_GUARD::QAB(C)
      • P(e);N_GUARD::S(E),XB(b)
      • P(h);OGATE::QAR(C)+P(D),XP(h)
      • P(i);N_GUARD::S(E)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).