MESON Chess Problem Database

Problem Display
PID: 207023 (8/5K2/8/1pp5/1k6/R7/6Q1/8 w - - 0 1)

Loyd, Sam

Household Journal, 1861

8/5K2/8/1pp5/1k6/R7/6Q1/8

#2

3 + 3

6490 yacpdb 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qe4#
  • Tries
    • 1.Qf3?
      • threat
        • 2.Qb3#
        • 2.Qc3#
      • 1...Kc4
        • 2.Qe4#
      • 1...c4!
    • 1.Qe4+?
      • 1...c4
        • 2.Qe7#
      • 1...Kxa3!
    • 1.Qd5?
      • threat
        • 2.Qb3#
      • 1...c4
        • 2.Qd6#
      • 1...Kxa3!
    • 1.Qc6?
      • 1...Kc4
        • 2.Qe4#
      • 1...c4
        • 2.Qd6#
      • 1...Kxa3!
    • 1.Qb7?
      • 1...Kc4
        • 2.Qe4#
      • 1...c4
        • 2.Qe7#
      • 1...Kxa3!
    • 1.Qe2?
      • 1...c4
        • 2.Qe7#
      • 1...Kxa3!
    • 1.Qg3?
      • threat
        • 2.Qb3#
        • 2.Qc3#
      • 1...c4
        • 2.Qd6#
      • 1...Kc4!
    • 1.Qg6?
      • 1...Kc4
        • 2.Qe4#
      • 1...c4
        • 2.Qd6#
      • 1...Kxa3!
  • Keys
    • 1.Qa8!
      • 1...Kc4
        • 2.Qe4#
      • 1...c4
        • 2.Qf8#

This anticipates 15833(1988)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAR2(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT::QAR2(A)
      • Refutation
        • P(c);
    • Try
      • Q(A);CHECK
      • Vars
        • P(c);OGATEB,P_SPINP(c),SBLOCK::QAB(A)
      • Refutation
        • K(a);S_FLIGHT,XR(B)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • P(c);OGATEB,SBLOCK::QAB(A)
      • Refutation
        • K(a);S_FLIGHT,XR(B)
    • Try
      • Q(A);
      • Vars
        • K(a);P-FLIGHT,P_SPINP(c)::QAR2(A)
        • P(c);OGATEB,SBLOCK::QAB(A)
      • Refutation
        • K(a);S_FLIGHT,XR(B)
    • Try
      • Q(A);P_PINP(b)
      • Vars
        • K(a);N_SPINP(b),P-FLIGHT::QAR2(A)
        • P(c);OGATEB,SBLOCK::QAB(A)
      • Refutation
        • K(a);N_SPINP(b),S_FLIGHT,XR(B)
    • Try
      • Q(A);
      • Vars
        • P(c);OGATEB,SBLOCK::QAB(A)
      • Refutation
        • K(a);S_FLIGHT,XR(B)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);OGATEB,SBLOCK::QAB(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);P-FLIGHT::QAR2(A)
        • P(c);OGATEB,SBLOCK::QAB(A)
      • Refutation
        • K(a);S_FLIGHT,XR(B)
  • Actual
    • Q(A);
    • Vars
      • K(a);P-FLIGHT::QAR2(A)
      • P(c);OGATEB,SBLOCK::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).