MESON Chess Problem Database

Problem Display
PID: 180345 (8/2p5/2Bb1B2/8/N1kP1P1R/P2p2p1/K4pr1/5b1Q w - - 0 1)

Lider, Valentin Viktorovich

3rd HM., diagrammes, 1978

8/2p5/2Bb1B2/8/N1kP1P1R/P2p2p1/K4pr1/5b1Q

#2

9 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rg1
      • 2.Qd5#
    • 1...Rh2
      • 2.Qd5#
    • 1...Be2
      • 2.Qc1#
    • 1...d2
      • 2.Qxf1#
  • Tries
    • 1.f5?
      • 1...Bxa3
        • 2.d5#
      • 1...d2
        • 2.Qxf1#
      • 1...Rg1
        • 2.Qd5#
      • 1...Rh2
        • 2.Qd5#
      • 1...Be2
        • 2.Qc1#
      • 1...Bb4
        • 2.d5#
      • 1...Bc5
        • 2.dxc5#
      • 1...Be5
        • 2.dxe5#
      • 1...Be7
        • 2.d5#
      • 1...Bf8
        • 2.d5#
      • 1...Bf4!
  • Keys
    • 1.d5!
      • 1...Bxa3
        • 2.f5#
      • 1...Bxf4
        • 2.Rxf4#
      • 1...Be5
        • 2.fxe5#
      • 1...d2
        • 2.Qxf1#
      • 1...Rg1
        • 2.Qe4#
      • 1...Rh2
        • 2.Qe4#
      • 1...Be2
        • 2.Qc1#
      • 1...Bb4
        • 2.f5#
      • 1...Bc5
        • 2.Sb2#
      • 1...Be7
        • 2.f5#
      • 1...Bf8
        • 2.f5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • R(c);OGATE::QAB1(A)
    • B(a);OGATE::QAR(A)
    • P(d);OGATEB::QAB(A),XB(a)
  • Tries
    • Try
      • P(F);
      • Vars
        • B(g);N_GUARD,XP(C)::R(G)+P(E)
        • P(d);OGATEB::QAB(A),XB(a)
        • R(c);OGATE::QAB1(A)
        • B(a);OGATE::QAR(A)
        • B(g);N_GUARD::R(G)+P(E)
        • B(g);OGATE::R(G)+P(E),XB(g)
      • Refutation
        • B(g);
  • Actual
    • P(E);
    • Vars
      • B(g);N_GUARD,XP(C)::R(G)+P(F)
      • B(g);OGATE,P_SPINB(g),XP(F)::R(G),XB(g)
      • B(g);OGATE::R(G)+P(F),XB(g)
      • P(d);OGATEB::QAB(A),XB(a)
      • R(c);OGATE::QAR2(A)
      • B(a);OGATE::QAR(A)
      • B(g);N_GUARD::R(G)+P(F)
      • B(g);SBLOCK::S(D)
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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).