MESON Chess Problem Database

Problem Display
PID: 156393 (8/7K/4P3/5pk1/8/5P2/2Q2B2/8 w - - 0 1)

Lewis, Brian Noel

Stratford Express, 1948

8/7K/4P3/5pk1/8/5P2/2Q2B2/8

#2

5 + 2

56 The Problemist 2014
5454 Near Snap 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Kh5
      • 2.Qxf5#
    • 1...f4
      • 2.Qg6#
  • Tries
    • 1.Kg7?
      • 1...Kh5
        • 2.Qxf5#
      • 1...f4
        • 2.Qg6#
        • 2.Qc5#
      • 1...Kf4!
    • 1.Bg3?
      • 1...Kh5
        • 2.Qxf5#
      • 1...f4
        • 2.Qg6#
      • 1...Kf6!
    • 1.Qd3?
      • 1...Kf4
        • 2.Qe3#
      • 1...Kh5
        • 2.Qxf5#
      • 1...f4
        • 2.Qg6#
      • 1...Kf6!
    • 1.Qe4?
      • threat
        • 2.Qh4#
      • 1...Kh5
        • 2.Qxf5#
        • 2.Qh4#
      • 1...Kf6
        • 2.Bh4#
      • 1...f4
        • 2.Qg6#
        • 2.Qe5#
      • 1...fxe4!
    • 1.Qc3?
      • 1...Kf4
        • 2.Qe3#
      • 1...f4
        • 2.Qe5#
      • 1...Kh5!
    • 1.Qc5?
      • 1...Kf4
        • 2.Qe3#
      • 1...Kh5
        • 2.Qxf5#
      • 1...Kf6!
  • Keys
    • 1.Qe2!
      • 1...Kf4
        • 2.Qe3#
      • 1...Kh5
        • 2.f4#
      • 1...Kf6
        • 2.Bh4#
      • 1...f4
        • 2.Qe5#

This anticipates 132863(1972), 46037(2002)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::QAR2(A),XP(a)
    • P(a);OGATE,SBLOCK::QAR1(A)
  • Tries
    • Try
      • K(E);P-FLIGHT
      • Vars
        • K(b);P-FLIGHT::QAR2(A),XP(a)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • B(B);
      • Vars
        • K(b);P-FLIGHT::QAR2(A),XP(a)
        • P(a);OGATE::QAR1(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
        • K(b);P-FLIGHT::QAR2(A),XP(a)
        • P(a);OGATE,SBLOCK::QAR1(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • K(b);S_FLIGHT::B(B)
      • Refutation
        • P(a);XQ(A)
    • Try
      • Q(A);
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
        • P(a);OGATEB::QAR2(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);P_PINP(a)
      • Vars
        • K(b);N_SPINP(a),S_FLIGHT::QAB1(A)
        • K(b);P-FLIGHT::QAR2(A),XP(a)
      • Refutation
        • K(b);N_SPINP(a),S_FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(b);S_FLIGHT::QAB1(A)
      • K(b);P-FLIGHT::QAB(A)+P(C)
      • K(b);S_FLIGHT::B(B)
      • P(a);OGATEB::QAR2(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).