MESON Chess Problem Database

Problem Display
PID: 172251 (4Q3/8/8/pp6/k7/8/K2n4/4B3 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kubanski krai, 1996

4Q3/8/8/pp6/k7/8/K2n4/4B3

#2

3 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Qd7?
      • 1...Kb4
        • 2.Qd4#
      • 1...Sb1
        • 2.Qd1#
      • 1...Sf1
        • 2.Qd1#
      • 1...Sf3
        • 2.Qd1#
      • 1...Sc4
        • 2.Qd1#
      • 1...Se4
        • 2.Qd1#
      • 1...Sb3!
    • 1.Qe4+?
      • 1...Sc4
        • 2.Qc2#
      • 1...b4
        • 2.Qc6#
        • 2.Qe8#
      • 1...Sxe4!
    • 1.Qd8?
      • 1...Kb4
        • 2.Qd4#
      • 1...Sb1
        • 2.Qxa5#
        • 2.Qd1#
      • 1...Sf1
        • 2.Qxa5#
        • 2.Qd1#
      • 1...Sf3
        • 2.Qxa5#
        • 2.Qd1#
      • 1...Sc4
        • 2.Qd1#
      • 1...Se4
        • 2.Qxa5#
        • 2.Qd1#
      • 1...b4
        • 2.Qd7#
        • 2.Qe8#
      • 1...Sb3!
  • Keys
    • 1.Qe3!
      • threat
        • 2.Qa3#
      • 1...Kb4
        • 2.Qd4#
      • 1...Sb3
        • 2.Qxb3#
      • 1...Sb1
        • 2.Qb3#
      • 1...Sc4
        • 2.Qb3#
      • 1...b4
        • 2.Qe8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);
      • Vars
        • K(b);N_SPINP(d),P-FLIGHT,P_SPINS(a)::QAR2(C)
        • S(a);OGATE::QAB(C)
      • Refutation
        • S(a);
    • Try
      • Q(C);CHECK,N_PINP(d)
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB(C)
      • Refutation
        • S(a);XQ(C)
    • Try
      • Q(C);N_PINP(d)
      • Vars
        • K(b);P-FLIGHT,P_SPINS(a)::QAR2(C)
        • S(a);OGATE::QAB(C)
      • Refutation
        • S(a);
  • Actual
    • Q(C);N_PINP(d)
    • Threat
      • QAR1(C)
    • Vars
      • K(b);P-FLIGHT,P_SPINS(a)::QAR2(C)
      • S(a);N_GUARD::QAB1(C),XS(a)
      • S(a);N_GUARD::QAB1(C)
      • P(d);OGATEB,SBLOCK::QAB(C)
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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).