MESON Chess Problem Database

Problem Display
PID: 248938 (8/8/8/8/8/Q1p3K1/6p1/3N2k1 w - - 0 1)

Krivenko, Valery Aleksinovich

Schakend Nederland, 1980

8/8/8/8/8/Q1p3K1/6p1/3N2k1

#2

3 + 3

15601 Albrecht-Leiss-Degener Collection 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Sf2?
      • threat
        • 2.Qc1#
        • 2.Qa1#
      • 1...c2
        • 2.Qc1#
      • 1...Kf1!
    • 1.Sxc3?
      • threat
        • 2.Qc1#
        • 2.Qa1#
      • 1...Kf1
        • 2.Qc1#
        • 2.Qa1#
      • 1...Kh1!
    • 1.Se3?
      • threat
        • 2.Qc1#
        • 2.Qa1#
      • 1...c2
        • 2.Qc1#
      • 1...Kh1!
    • 1.Qc5+?
      • 1...Kf1
        • 2.Qf2#
      • 1...Kh1!
    • 1.Qa1?
      • threat
        • 2.Sb2#
        • 2.Sf2#
        • 2.Sxc3#
        • 2.Se3#
      • 1...Kf1
        • 2.Sxc3#
      • 1...Kh1
        • 2.Sf2#
      • 1...c2!
    • 1.Qa2?
      • threat
        • 2.Qxg2#
      • 1...Kf1
        • 2.Qf2#
      • 1...Kh1
        • 2.Qxg2#
      • 1...c2!
    • 1.Qa7+?
      • 1...Kf1
        • 2.Qf2#
      • 1...Kh1!
    • 1.Qa8?
      • threat
        • 2.Qxg2#
      • 1...Kh1
        • 2.Qxg2#
      • 1...Kf1!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Sb2#
        • 2.Sf2#
        • 2.Sxc3#
        • 2.Se3#
      • 1...Kf1
        • 2.Sxc3#
      • 1...Kh1
        • 2.Sf2#
      • 1...c2
        • 2.Sb2#
        • 2.Sf2#
        • 2.Sc3#
        • 2.Se3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);::QAR(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(A);XP(c)
      • Threat
        • DUALS(2)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);::QAR(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • DUALS(4)
      • Vars
        • K(a);P-FLIGHT::QAR(B)+S(A),XP(c)
        • K(a);P-FLIGHT::QAR(B)+S(A),DCHECK
      • Refutation
        • P(c);
    • Try
      • Q(B);
      • Threat
        • QAR1(B),XP(b)
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
        • K(a);P-FLIGHT::QAB1(B),XP(b)
      • Refutation
        • P(c);
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAR1(B),XP(b)
      • Vars
        • K(a);P-FLIGHT,P_SPINP(b)::QAB1(B),XP(b)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • DUALS(4)
    • Vars
      • K(a);P-FLIGHT::QAR(B)+S(A),XP(c)
      • K(a);P-FLIGHT::QAR(B)+S(A),DCHECK
HTML5 logo

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).