MESON Chess Problem Database

Problem Display
PID: 121624 (8/2R5/1pB1rR2/2p1k3/4P3/8/7K/6Q1 w - - 0 1)

Gottstein, Claudius

Source?, 0000

8/2R5/1pB1rR2/2p1k3/4P3/8/7K/6Q1

#2

6 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Qg3#
    • 1...Kxf6
      • 2.Qg7#
    • 1...Re7
      • 2.Qa1#
    • 1...Re8
      • 2.Qa1#
  • Tries
    • 1.Rxe6+?
      • 1...Kf4
        • 2.Rf7#
        • 2.Qg3#
      • 1...Kxe6!
    • 1.Qxc5+?
      • 1...Kxf6
        • 2.Qf5#
      • 1...bxc5!
    • 1.Qg3+?
      • 1...Kxf6
        • 2.Qg7#
      • 1...Kd4!
    • 1.Qg5+?
      • 1...Kd6
        • 2.Qf4#
        • 2.Qg3#
      • 1...Kd4!
  • Keys
    • 1.Re7!
      • threat
        • 2.Rexe6#
      • 1...Kd6
        • 2.Rfxe6#
      • 1...Kxf6
        • 2.Qg7#
      • 1...Rxe7
        • 2.Qa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • K(b);P_SPINR(d),S_FLIGHT::QAB(A)
    • K(b);OGATEB,S_FLIGHT,XR(E)::QAB1(A)
    • R(d);::QAB(A)
  • Tries
    • Try
      • R(E);CHECK,XR(d)
      • Refutation
        • K(b);P-FLIGHT,XR(E)
    • Try
      • Q(A);CHECK,XP(a)
      • Vars
        • K(b);OGATE,S_FLIGHT,XR(E)::QAR1(A)
      • Refutation
        • P(c);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);OGATEB,S_FLIGHT,XR(E)::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • R(F);P_PINR(d)
    • Threat
      • R1(F),XR(d)
    • Vars
      • K(b);S_FLIGHT::R1(E),XR(d)
      • K(b);N_SPINR(d),OGATEB,S_FLIGHT,XR(E)::QAB1(A)
      • R(d);N_SPINR(d),XR(F)::QAB(A)
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).