MESON Chess Problem Database

Problem Display
PID: 227486 (4K3/7n/4kp2/8/5QN1/2N5/8/8 w - - 0 1)

Onitiu, Valerian

Magyar Sakkvilag, 1926

4K3/7n/4kp2/8/5QN1/2N5/8/8

#2

4 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sg5
      • 2.Qxf6#
    • 1...Sf8
      • 2.Qxf6#
    • 1...f5
      • 2.Qe5#
  • Tries
    • 1.Sb5?
      • threat
        • 2.Sc7#
        • 2.Qe4#
      • 1...Sg5
        • 2.Sc7#
      • 1...f5
        • 2.Sc7#
        • 2.Qe5#
        • 2.Qd6#
        • 2.Qc4#
      • 1...Kd5!
    • 1.Qd2?
      • threat
        • 2.Qd5#
        • 2.Qd7#
      • 1...Sf8
        • 2.Qd5#
      • 1...Kf5!
    • 1.Qe3+?
      • 1...Kd6
        • 2.Qb6#
      • 1...Kf5!
    • 1.Qf1?
      • 1...Sg5
        • 2.Qxf6#
      • 1...Sf8
        • 2.Qxf6#
      • 1...f5
        • 2.Qa6#
      • 1...Kd6!
    • 1.Qc4+?
      • 1...Kd6
        • 2.Se4#
        • 2.Sb5#
      • 1...Kf5!
    • 1.Qd4?
      • threat
        • 2.Qd5#
        • 2.Qd7#
      • 1...Sf8
        • 2.Qxf6#
        • 2.Qd5#
      • 1...Kf5!
  • Keys
    • 1.Qf2!
      • 1...Kd6
        • 2.Qb6#
      • 1...Sg5
        • 2.Qxf6#
      • 1...Sf8
        • 2.Qxf6#
      • 1...f5
        • 2.Qb6#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::QAR1(B),XP(b)
    • P(b);N_GUARD::QAR1(B)
  • Tries
    • Try
      • S(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);::S(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);::QAB1(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR2(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • S(c);N_GUARD::QAR1(B),XP(b)
        • P(b);SBLOCK::QAR(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);P-FLIGHT::QAR2(B)
      • S(c);N_GUARD::QAR1(B),XP(b)
      • P(b);SBLOCK::QAR(B)
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).