MESON Chess Problem Database

Problem Display
PID: 180224 (b7/6nK/4rPQb/6pp/qp3Nkp/2r5/4PR1B/3B2N1 w - - 0 1)

Lider, Valentin Viktorovich

7th HM., Magyar Sakkelet, 1979

b7/6nK/4rPQb/6pp/qp3Nkp/2r5/4PR1B/3B2N1

#2

9 + 11

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rcc6
      • 2.Rg2#
    • 1...Sf5
      • 2.Qxh5#
  • Tries
    • 1.Sd3?
      • threat
        • 2.Rf4#
      • 1...Rxf6
        • 2.Se5#
      • 1...Re4
        • 2.Rg2#
      • 1...Bf3
        • 2.exf3#
      • 1...b3
        • 2.e4#
      • 1...Rc4!
    • 1.e3+?
      • 1...Bf3
        • 2.Bxf3#
        • 2.Rg2#
      • 1...Qxd1!
    • 1.e4+?
      • 1...Rf3
        • 2.Bxf3#
        • 2.Rg2#
      • 1...Qxd1!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Rf4#
      • 1...Rxf6
        • 2.Sxf6#
      • 1...Rf3
        • 2.exf3#
      • 1...Rc4
        • 2.Rg2#
      • 1...Re4
        • 2.Qxe4#
      • 1...b3
        • 2.e3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • R(a);N_GUARD,S_CUTB(k)::R(D)
    • S(j);N_GUARD,SBLOCK::QAB1(H),XP(g)
  • Tries
    • Try
      • S(F);
      • Threat
        • R1(D)
      • Vars
        • R(h);N_GUARD,XP(G)::S(F)
        • R(h);S_CUTB(k)::R(D)
        • B(k);OGATE::P(C),XB(k)
        • P(c);S_CUTQ(b)::B(A)+P(C)
      • Refutation
        • R(a);
    • Try
      • P(C);CHECK
      • Refutation
        • Q(b);XB(A)
    • Try
      • P(C);CHECK
      • Refutation
        • Q(b);XB(A)
  • Actual
    • S(F);
    • Threat
      • R1(D)
    • Vars
      • R(h);XP(G)::S(F),XR(h)
      • R(a);OGATE::P(C),XR(a)
      • R(a);N_GUARD::R(D)
      • R(h);N_GUARD::QAR2(H),XR(h)
      • P(c);S_CUTQ(b)::B(A)+P(C)
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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).