MESON Chess Problem Database

Problem Display
PID: 258832 (8/6p1/6R1/8/5N1k/4K3/2Q1b2P/6r1 w - - 0 1)

Yakimovich, Daniil

The Problemist Supplement, 2021

8/6p1/6R1/8/5N1k/4K3/2Q1b2P/6r1

#2

5 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Rg3+
      • 2.hxg3#
  • Tries
    • 1.Qxe2?
      • threat
        • 2.Qh5#
      • 1...Rg3+
        • 2.hxg3#
      • 1...Re1
        • 2.Rg4#
        • 2.Qxe1#
      • 1...Rg4
        • 2.Rxg4#
        • 2.Qxg4#
      • 1...Rg5!
    • 1.Qc8?
      • threat
        • 2.Qh3#
      • 1...Rg3+
        • 2.hxg3#
      • 1...Rg4
        • 2.Qh8#
      • 1...Bf1
        • 2.Qh8#
      • 1...Bg4
        • 2.Qd8#
      • 1...Rxg6!
  • Keys
    • 1.Qf5!
      • threat
        • 2.Qh3#
      • 1...Rg3+
        • 2.hxg3#
      • 1...Rxg6
        • 2.Sxg6#
      • 1...Rg4
        • 2.Qh5#
      • 1...Bf1
        • 2.Qh5#
      • 1...Bg4
        • 2.Qg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(a);CHECK,OGATE::P(B),XR(a)
  • Tries
    • Try
      • Q(A);XB(b)
      • Threat
        • QAR1(A)
      • Vars
        • R(a);CHECK,OGATE::P(B),XR(a)
      • Refutation
        • R(a);
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • R(a);CHECK,OGATE::P(B),XR(a)
        • R(a);S_CUTB(b)::QAR(A)
        • B(b);N_GUARD::QAR(A)
        • B(b);S_CUTR(a)::QAB(A)
      • Refutation
        • R(a);XR(E)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • R(a);CHECK,OGATE::P(B),XR(a)
      • R(a);XR(E)::S(D),XR(a)
      • R(a);S_CUTB(b)::QAR1(A)
      • B(b);N_GUARD::QAR1(A)
      • B(b);S_CUTR(a)::QAB1(A)
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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).