MESON Chess Problem Database

Problem Display
PID: 172247 (3b4/1K1kpP2/5P2/8/8/6Q1/8/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kubanski krai, 1996

3b4/1K1kpP2/5P2/8/8/6Q1/8/8

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...e6
      • 2.Qd3#
  • Tries
    • 1.Qh3+?
      • 1...e6
        • 2.Qd3#
      • 1...Kd6!
    • 1.Qg4+?
      • 1...e6
        • 2.Qd1#
        • 2.Qd4#
      • 1...Kd6!
    • 1.f8Q?
      • 1...exf6
        • 2.Qgd6#
      • 1...Ba5
        • 2.Qxe7#
        • 2.Qc8#
      • 1...Bb6
        • 2.Qxe7#
        • 2.Qc8#
      • 1...Bc7
        • 2.Qxe7#
        • 2.Qc8#
      • 1...e5
        • 2.Qh3#
        • 2.Qg4#
      • 1...e6
        • 2.Qgd6#
        • 2.Qd3#
      • 1...Ke6!
  • Keys
    • 1.Qe5!
      • threat
        • 2.Qd5#
      • 1...exf6
        • 2.f8S#
      • 1...Bc7
        • 2.Qxe7#
      • 1...e6
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(b);SBLOCK::QAR(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • P(b);P_SPINP(b),SBLOCK::QAR(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • P(D);
      • Vars
        • P(b);N_GUARD,XP(B)::QAR1(A)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR2(A)
    • Vars
      • P(b);XP(B)::P=S
      • B(c);N_GUARD::QAR1(A),XP(b)
      • P(b);SBLOCK::QAR(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).