MESON Chess Problem Database

Problem Display
PID: 214486 (3n2Q1/3K4/8/2B5/3Pkp2/1P1p4/7N/1N6 w - - 0 1)

Taunton, WD

Australasian (The), 1877

3n2Q1/3K4/8/2B5/3Pkp2/1P1p4/7N/1N6

#2

7 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Se6
      • 2.Qxe6#
    • 1...Sb7
      • 2.Qe6#
  • Tries
    • 1.Qh7+?
      • 1...Kd5
        • 2.Sc3#
        • 2.Qf5#
      • 1...Ke3!
    • 1.Qg2+?
      • 1...Ke3
        • 2.Sf1#
        • 2.Sg4#
        • 2.Qf3#
        • 2.d5#
      • 1...f3
        • 2.Qxf3#
      • 1...Kf5!
    • 1.Qg6+?
      • 1...Kd5
        • 2.Sc3#
        • 2.Qf5#
      • 1...Ke3!
    • 1.Qe8+?
      • 1...Kd5
        • 2.Sc3#
        • 2.Qe5#
      • 1...Se6
        • 2.Qxe6#
      • 1...Kf5!
  • Keys
    • 1.Qd5+!
      • 1...Ke3
        • 2.Qf3#
      • 1...Kxd5
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • S(d);N_GUARD::QAR2(G),XS(d)
    • S(d);N_GUARD::QAR2(G)
  • Tries
    • Try
      • Q(G);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(G);CHECK
      • Vars
        • P(c);P_SPINP(c)::QAB1(G),XP(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(G);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(G);CHECK
      • Vars
        • S(d);N_GUARD,P_SPINS(d)::QAR2(G),XS(d)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(G);CHECK
    • Vars
      • K(b);OGATE,P-FLIGHT::QAR1(G)
      • K(b);S_FLIGHT,XQ(G)::S(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).