MESON Chess Problem Database

Problem Display
PID: 195193 (b7/5K2/8/3kB3/3P4/N4p2/2PP4/4Q3 w - - 0 1)

MacBride, Robert C

Brisbane Courier, 1918

b7/5K2/8/3kB3/3P4/N4p2/2PP4/4Q3

#2

7 + 3

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bc6
      • 2.c4#
    • 1...f2
      • 2.Qh1#
  • Tries
    • 1.Qf1?
      • threat
        • 2.Qxf3#
      • 1...Kc6
        • 2.Qb5#
      • 1...f2
        • 2.Qg2#
        • 2.Qh1#
      • 1...Ke4!
    • 1.Qe2?
      • threat
        • 2.Qxf3#
      • 1...Kc6
        • 2.Qb5#
      • 1...f2
        • 2.Qf3#
      • 1...fxe2!
    • 1.Qe3?
      • threat
        • 2.Qxf3#
      • 1...f2
        • 2.Qf3#
      • 1...Kc6!
  • Keys
    • 1.Qb1!
      • 1...Ke4
        • 2.c4#
      • 1...Kc6
        • 2.Qb5#
      • 1...Bb7
        • 2.Qxb7#
      • 1...Bc6
        • 2.c4#
      • 1...f2
        • 2.Qh1#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(c);SBLOCK::P(B)
    • P(a);OGATEB::QAB(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB(A),XP(a)
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAB(A),XP(a)
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
        • P(a);::QAB(A)
      • Refutation
        • P(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAB(A),XP(a)
      • Vars
        • P(a);::QAB(A)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(b);S_FLIGHT::QAB(A)+P(B)
      • K(b);S_FLIGHT::QAB1(A)
      • B(c);N_GUARD::QAB(A),XB(c)
      • B(c);SBLOCK::P(B)
      • P(a);OGATEB::QAB(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).