MESON Chess Problem Database

Problem Display
PID: 172401 (8/8/8/4Q2p/6k1/4K2n/8/7R w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 1997

8/8/8/4Q2p/6k1/4K2n/8/7R

#2

3 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kh4
      • 2.Qf4#
    • 1...Sg1
      • 2.Qf4#
    • 1...Sf2
      • 2.Qf4#
    • 1...Sf4
      • 2.Qxf4#
    • 1...Sg5
      • 2.Qf4#
  • Tries
    • 1.Rg1+?
      • 1...Kh4
        • 2.Qg3#
      • 1...Sxg1!
    • 1.Qf5+?
      • 1...Kg3
        • 2.Qxh3#
      • 1...Kh4
        • 2.Rxh3#
        • 2.Qf4#
      • 1...Kxf5!
    • 1.Qxh5+?
      • 1...Kg3
        • 2.Qxh3#
      • 1...Kxh5!
  • Keys
    • 1.Rh2!
      • 1...Kh4
        • 2.Qf4#
      • 1...Sg1
        • 2.Qf4#
      • 1...Sf2
        • 2.Qf4#
      • 1...Sf4
        • 2.Qxf4#
      • 1...Sg5
        • 2.Qf4#
      • 1...h4
        • 2.Rg2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT,P_SPINS(a)::QAR2(C)
    • S(a);N_GUARD::QAR1(C)
    • S(a);N_GUARD::QAR1(C),XS(a)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(C)
      • Refutation
        • S(a);XR(A)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT::QAR1(C),XS(a)
      • Refutation
        • K(b);S_FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK,XP(c)
      • Vars
        • K(b);P-FLIGHT::QAR1(C),XS(a)
      • Refutation
        • K(b);P_SPINS(a),S_FLIGHT,XQ(C)
  • Actual
    • R(A);
    • Vars
      • K(b);P-FLIGHT,P_SPINS(a)::QAR2(C)
      • S(a);N_GUARD::QAR1(C)
      • S(a);N_GUARD::QAR1(C),XS(a)
      • P(c);SBLOCK::R(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).