MESON Chess Problem Database

Problem Display
PID: 172240 (7N/4PPkn/3K4/8/8/8/3Q4/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kubanski krai, 1996

7N/4PPkn/3K4/8/8/8/3Q4/8

#2

5 + 2

6490 yacpdb 2018
5454 Near Snap 2019

SOLUTION

  • SOUND
  • Tries
    • 1.Qg5+?
      • 1...Kxh8
        • 2.Qg8#
      • 1...Sxg5!
    • 1.Qh6+?
      • 1...Kxh8
        • 2.e8Q#
        • 2.e8R#
        • 2.f8Q#
        • 2.f8R#
      • 1...Kxh6!
    • 1.Qg2+?
      • 1...Kf6
        • 2.Qg6#
      • 1...Kh6
        • 2.Qg6#
      • 1...Kxh8
        • 2.Qg8#
      • 1...Sg5!
    • 1.e8S+?
      • 1...Kf8
        • 2.Qh6#
      • 1...Kxh8!
  • Keys
    • 1.Qh2!
      • 1...Kf6
        • 2.Qe5#
      • 1...Kxh8
        • 2.f8Q#
      • 1...Sf6
        • 2.f8Q#
      • 1...Sg5
        • 2.f8Q#
      • 1...Sf8
        • 2.e8S#

Anticipated by 9762(1909)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT,XS(E)::QAR1(A)
      • Refutation
        • S(b);XQ(A)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);S_FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR1(A)
        • K(a);OGATE,S_FLIGHT,XS(E)::QAR1(A)
      • Refutation
        • S(b);P_SPINS(b)
    • Try
      • P(C);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB(A)
      • Refutation
        • K(a);S_FLIGHT,XS(E)
  • Actual
    • Q(A);
    • Vars
      • K(a);S_FLIGHT::QAB1(A)
      • K(a);P_SPINS(b),S_FLIGHT,XS(E)::P=Q
      • S(b);N_GUARD::P=Q
      • S(b);SBLOCK::P=S
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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).