MESON Chess Problem Database

Problem Display
PID: 263109 (4Q3/8/1N3p2/p4R2/1rN2p2/1k6/3B4/1K6 w - - 0 1)

Tkachenko, Sergiy Ivanovich

SuperProblem, 2020

4Q3/8/1N3p2/p4R2/1rN2p2/1k6/3B4/1K6

#2

6 + 5

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Ra4
      • 2.Qxa4#
    • 1...Rb5
      • 2.Rxb5#
      • 2.Qxb5#
    • 1...f3
      • 2.Rxf3#
      • 2.Qe3#
  • Tries
    • 1.Rxa5?
      • threat
        • 2.Ra3#
      • 1...Rxb6
        • 2.Qa4#
      • 1...Ra4
        • 2.Qxa4#
      • 1...Rxc4!
    • 1.Rb5?
      • 1...Rxb5
        • 2.Qxb5#
      • 1...f3
        • 2.Qe3#
      • 1...a4
        • 2.Rxb4#
      • 1...f5!
    • 1.Qe4?
      • threat
        • 2.Qc2#
        • 2.Qd3#
        • 2.Qf3#
      • 1...Rxb6
        • 2.Qc2#
      • 1...f3
        • 2.Rxf3#
        • 2.Qc2#
        • 2.Qd3#
        • 2.Qxf3#
        • 2.Qe3#
      • 1...Rxc4!
  • Keys
    • 1.Qb5!
      • 1...Rxb5
        • 2.Rxb5#
      • 1...f3
        • 2.Rxf3#
      • 1...a4
        • 2.Qxb4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(b);N_GUARD::QAB1(F),XR(b)
  • Tries
    • Try
      • R(D);XP(d)
      • Threat
        • R1(D)
      • Vars
        • R(b);N_GUARD,XS(E)::QAB1(F)
        • R(b);N_GUARD::QAB1(F),XR(b)
      • Refutation
        • R(b);XS(C)
    • Try
      • R(D);P_PINR(b)
      • Vars
        • R(b);N_SPINR(b),OGATE,XR(D)::QAR2(F),XR(b)
        • P(c);N_GUARD::QAR(F)
        • P(d);N_GUARD::R1(D),XR(b)
      • Refutation
        • P(e);
    • Try
      • Q(F);
      • Threat
        • DUALS(3)
      • Vars
        • R(b);XS(E)::QAB1(F)
      • Refutation
        • R(b);XS(C)
  • Actual
    • Q(F);P_PINR(b)
    • Vars
      • R(b);N_SPINR(b),OGATE,XQ(F)::R(D),XR(b)
      • P(c);OGATE::R(D),XP(c)
      • P(d);N_GUARD::QAR1(F),XR(b)
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).