MESON Chess Problem Database

Problem Display
PID: 229065 (5n1b/5B2/1nN3p1/1R1b1k1N/8/8/4rPQP/5R1K w - - 0 1)

Grigoriev, K

3rd Prize, Volk und Zeit, 1926

5n1b/5B2/1nN3p1/1R1b1k1N/8/8/4rPQP/5R1K

#2

9 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf2
      • 2.Rxf2#
    • 1...Re3
      • 2.fxe3#
    • 1...Re5
      • 2.Sd4#
    • 1...Be5
      • 2.Se7#
    • 1...Se6
      • 2.Bxg6#
    • 1...g5
      • 2.Qf3#
  • Tries
    • 1.Rxd5+?
      • 1...Re5
        • 2.Sd4#
        • 2.Se7#
      • 1...Be5
        • 2.Sd4#
        • 2.Se7#
      • 1...Sxd5!
  • Keys
    • 1.h4!
      • threat
        • 2.Qf3#
      • 1...Rxf2
        • 2.Rxf2#
      • 1...Re3
        • 2.fxe3#
      • 1...Re4
        • 2.Qg5#
      • 1...Re5
        • 2.Sd4#
      • 1...Be5
        • 2.Se7#
      • 1...Se6
        • 2.Bxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(a);OGATE,P_SPINR(a),XP(C)::R(A),XR(a)
    • R(a);OGATE::R(A)+P(C),XR(a)
    • R(a);N_SPINB(b),SBLOCK,S_CUTB(g)::S(H)
    • B(g);N_SPINB(b),SBLOCK,S_CUTR(a)::S(H)
    • S(f);N_GUARD,SBLOCK::B(I),XP(e)
    • P(e);SBLOCK::QAR2(D)
  • Tries
    • Try
      • R(F);CHECK,N_SPINQ(D),XB(b)
      • Refutation
        • S(d);XR(F)
  • Actual
    • P(E);
    • Threat
      • QAR2(D)
    • Vars
      • R(a);OGATE,P_SPINR(a),XP(C)::R(A),XR(a)
      • R(a);OGATE::R(A)+P(C),XR(a)
      • R(a);N_PINQ(D),SBLOCK::QAR1(D)
      • R(a);N_SPINB(b),SBLOCK,S_CUTB(g)::S(H)
      • B(g);N_SPINB(b),SBLOCK,S_CUTR(a)::S(H)
      • S(f);N_GUARD,SBLOCK::B(I),XP(e)
HTML5 logo

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).