MESON Chess Problem Database

Problem Display
PID: 207126 (K7/7N/4pp2/5k1P/3p3p/3PP2P/2B5/4Q3 w - - 0 1)

Clarke, JW

New York Turf, Field and Farm, 1866

K7/7N/4pp2/5k1P/3p3p/3PP2P/2B5/4Q3

#2

8 + 5

5454 Near Snap 2020
3713 Snap 2020
6490 yacpdb 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Qg3?
      • threat
        • 2.Qf4#
        • 2.e4#
      • 1...dxe3
        • 2.d4#
      • 1...e5
        • 2.Qg4#
      • 1...hxg3!
    • 1.Qb4?
      • 1...Ke5
        • 2.Qc5#
      • 1...dxe3
        • 2.Qe4#
      • 1...e5!
    • 1.Qxh4?
      • threat
        • 2.Qxf6#
        • 2.Qe4#
        • 2.Qf4#
      • 1...dxe3
        • 2.Qxf6#
        • 2.Qe4#
        • 2.d4#
      • 1...e5
        • 2.Qxf6#
        • 2.Qg4#
      • 1...Ke5!
    • 1.exd4?
      • threat
        • 2.Qf2#
        • 2.Qf1#
        • 2.Qe4#
      • 1...Kf4
        • 2.Qf2#
      • 1...e5!
  • Keys
    • 1.Qc3!
      • 1...Ke5
        • 2.Qc5#
      • 1...dxc3
        • 2.d4#
      • 1...dxe3
        • 2.Qxf6#
      • 1...e5
        • 2.Qc8#

Anticipated by 207055(1865), 123427(1865)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(a);OGATE,XP(D)::B(B)+P(C)
        • P(d);SBLOCK::QAB1(A)
      • Refutation
        • P(b);XQ(A)
    • Try
      • Q(A);
      • Vars
        • K(c);P-FLIGHT::QAR2(A)
        • P(a);OGATE,XP(D)::QAB1(A)
      • Refutation
        • P(d);
    • Try
      • Q(A);XP(b)
      • Threat
        • DUALS(3)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • P(D);XP(a)
      • Threat
        • DUALS(3)
      • Vars
        • K(c);P-FLIGHT::QAR2(A)
      • Refutation
        • P(d);
  • Actual
    • Q(A);
    • Vars
      • K(c);P-FLIGHT,P_SPINP(a)::QAR2(A)
      • P(a);OGATE,XQ(A)::B(B)+P(C)
      • P(a);OGATE,XP(D)::QAR1(A),XP(e)
      • P(d);OGATEB,SBLOCK::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).