Problem Display
PID: 257662 (8/1b3K2/8/R1ppkN2/5pp1/3Q1P2/4N3/8 w - - 0 1)

Shpakovsky, Aleksandr Nikolaevich

64 Shakhmatnoe obozrenie, 2022

8/1b3K2/8/R1ppkN2/5pp1/3Q1P2/4N3/8

#2

6 + 6


SOLUTION


  • SOUND
  • Sets
    • 1...c4
      • 2.Qe4#
  • Tries
    • 1.Qc4?
      • threat
        • 2.Qxf4#
      • 1...Kxf5
        • 2.Qxf4#
      • 1...d4
        • 2.Qe6#
      • 1...dxc4!
    • 1.Qd2?
      • threat
        • 2.Qxf4#
      • 1...Kxf5
        • 2.Qxf4#
      • 1...d4!
    • 1.Qc3+?
      • 1...Kxf5
        • 2.Qf6#
      • 1...d4!
    • 1.Qe3+?
      • 1...Kxf5
        • 2.Qxf4#
      • 1...fxe3!
    • 1.Qd4+?
      • 1...Kxf5
        • 2.Qf6#
        • 2.Qxf4#
      • 1...cxd4!
  • Keys
    • 1.Sed4!
      • threat
        • 2.Qe2#
      • 1...gxf3
        • 2.Sxf3#
      • 1...cxd4
        • 2.Qe4#
      • 1...Ba6
        • 2.Sc6#

FEATURES


  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(c);P_SPINP(d)::QAR1(B)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB1(B),XP(a)
      • Vars
        • K(e);P-FLIGHT,XS(E)::QAR1(B),XP(a)
        • P(d);OGATE,P_SPINP(c)::QAR1(B)
      • Refutation
        • P(d);P_SPINP(c),XQ(B)
    • Try
      • Q(B);
      • Threat
        • QAB1(B),XP(a)
      • Vars
        • K(e);P-FLIGHT,XS(E)::QAR1(B),XP(a)
      • Refutation
        • P(d);P_SPINP(c)
    • Try
      • Q(B);CHECK
      • Vars
        • K(e);OGATE,P-FLIGHT,XS(E)::QAR1(B)
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • Q(B);CHECK
      • Vars
        • K(e);P-FLIGHT,XS(E)::QAR1(B),XP(a)
      • Refutation
        • P(a);XQ(B)
    • Try
      • Q(B);CHECK
      • Refutation
        • P(c);P_SPINP(d),XQ(B)
  • Actual
    • S(A);
    • Threat
      • QAR(B)
    • Vars
      • P(b);XP(C)::S(A),XP(b)
      • P(c);P_SPINP(d),XS(A)::QAR1(B)
      • B(f);N_GUARD::S(A)


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).