MESON Chess Problem Database

Problem Display
PID: 261930 (5R1b/1K1p4/4k3/2Q5/7B/8/8/8 w - - 0 1)

Restad, Birger

Problemnoter, 1963

5R1b/1K1p4/4k3/2Q5/7B/8/8/8

#2

4 + 3

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Bf6
      • 2.Rxf6#
    • 1...d5
      • 2.Qe7#
    • 1...d6
      • 2.Qf5#
  • Tries
    • 1.Kc7?
      • threat
        • 2.Qd6#
        • 2.Qf5#
      • 1...d5
        • 2.Qd6#
        • 2.Qe7#
      • 1...Bf6
        • 2.Rxf6#
      • 1...d6
        • 2.Qxd6#
        • 2.Qf5#
      • 1...Be5+!
    • 1.Bg3?
      • threat
        • 2.Qd6#
      • 1...d6
        • 2.Qxd6#
      • 1...Be5
        • 2.Qxe5#
      • 1...Bf6!
    • 1.Be7?
      • threat
        • 2.Qd6#
      • 1...d6
        • 2.Qxd6#
      • 1...Bf6
        • 2.Rxf6#
      • 1...Be5!
  • Keys
    • 1.Rf5!
      • threat
        • 2.Qd5#
      • 1...Be5
        • 2.Qxe5#
      • 1...Bf6
        • 2.Rxf6#
      • 1...d5
        • 2.Qxd5#
      • 1...d6
        • 2.Qc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • B(c);N_GUARD::R1(D),XB(c)
    • P(b);SBLOCK::QAR1(B)
    • P(b);SBLOCK::QAB1(B)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • B(c);N_GUARD::R1(D),XB(c)
      • Refutation
        • B(c);CHECK
    • Try
      • B(A);
      • Threat
        • QAR1(B)
      • Vars
        • P(b);::QAR1(B),XP(b)
        • B(c);N_GUARD::QAR1(B),XB(c)
      • Refutation
        • B(c);
    • Try
      • B(A);
      • Threat
        • QAR1(B)
      • Vars
        • P(b);::QAR1(B),XP(b)
        • B(c);N_GUARD::R1(D),XB(c)
      • Refutation
        • B(c);
  • Actual
    • R(D);
    • Threat
      • QAB1(B)
    • Vars
      • B(c);N_GUARD::QAR1(B),XB(c)
      • B(c);N_GUARD::R1(D),XB(c)
      • P(b);::QAB1(B),XP(b)
      • P(b);OGATEB,SBLOCK::QAB(B)
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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).