MESON Chess Problem Database

Problem Display
PID: 227758 (3K1k1q/3P3B/5NQ1/8/8/8/8/8 w - - 0 1)

Lazard, Frederic

Magyar Sakkvilag, 1926

3K1k1q/3P3B/5NQ1/8/8/8/8/8

#2

5 + 2

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf6+
      • 2.Qxf6#
    • 1...Qg7
      • 2.Qe8#
    • 1...Qxh7
      • 2.Sxh7#
    • 1...Qg8
      • 2.Qxg8#
  • Tries
    • 1.Kc8?
      • threat
        • 2.d8Q#
      • 1...Qxf6
        • 2.Qxf6#
      • 1...Ke7+!
    • 1.Se4?
      • 1...Qf6+
        • 2.Qxf6#
      • 1...Qa1
        • 2.Qg8#
      • 1...Qb2
        • 2.Qg8#
      • 1...Qc3
        • 2.Qg8#
      • 1...Qd4
        • 2.Qg8#
      • 1...Qe5
        • 2.Qg8#
      • 1...Qg7
        • 2.Qe8#
      • 1...Qg8
        • 2.Qxg8#
      • 1...Qxh7!
    • 1.Sg4?
      • 1...Qf6+
        • 2.Qxf6#
      • 1...Qa1
        • 2.Qg8#
      • 1...Qb2
        • 2.Qg8#
      • 1...Qc3
        • 2.Qg8#
      • 1...Qd4
        • 2.Qg8#
      • 1...Qe5
        • 2.Qg8#
      • 1...Qg7
        • 2.Qe8#
      • 1...Qg8
        • 2.Qxg8#
      • 1...Qxh7!
    • 1.Sd5?
      • 1...Qf6+
        • 2.Qxf6#
      • 1...Qa1
        • 2.Qg8#
      • 1...Qb2
        • 2.Qg8#
      • 1...Qc3
        • 2.Qg8#
      • 1...Qd4
        • 2.Qg8#
      • 1...Qe5
        • 2.Qg8#
      • 1...Qg7
        • 2.Qe8#
      • 1...Qg8
        • 2.Qxg8#
      • 1...Qxh7!
    • 1.Se8?
      • 1...Qf6+
        • 2.Qxf6#
      • 1...Qa1
        • 2.Qg8#
      • 1...Qb2
        • 2.Qg8#
      • 1...Qc3
        • 2.Qg8#
      • 1...Qd4
        • 2.Qg8#
      • 1...Qe5
        • 2.Qg8#
      • 1...Qg7
        • 2.Qxg7#
      • 1...Qg8
        • 2.Qxg8#
      • 1...Qxh7!
  • Keys
    • 1.Sh5!
      • threat
        • 2.Qe8#
      • 1...Qf6+
        • 2.Qxf6#
      • 1...Qe5
        • 2.Qg8#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • Q(b);CHECK,OGATE,XS(A)::QAR2(B),XQ(b)
    • Q(b);SBLOCK::QAR1(B)
    • Q(b);XB(D)::S(A),XQ(b)
    • Q(b);N_GUARD::QAR1(B),XQ(b)
  • Tries
    • Try
      • K(E);P-FLIGHT
      • Threat
        • P=Q
      • Vars
        • Q(b);OGATE,XS(A)::QAR2(B),XQ(b)
      • Refutation
        • K(a);CHECK,S_FLIGHT
    • Try
      • S(A);
      • Vars
        • Q(b);CHECK,N_GUARD::QAR2(B),XQ(b)
        • Q(b);N_GUARD::QAR1(B)
        • Q(b);N_GUARD,P_PINP(C)::QAR1(B)
        • Q(b);SBLOCK::QAR1(B)
        • Q(b);N_GUARD::QAR1(B),XQ(b)
      • Refutation
        • Q(b);XB(D)
    • Try
      • S(A);
      • Vars
        • Q(b);CHECK,N_GUARD::QAR2(B),XQ(b)
        • Q(b);N_GUARD::QAR1(B)
        • Q(b);N_GUARD,P_PINP(C)::QAR1(B)
        • Q(b);SBLOCK::QAR1(B)
        • Q(b);N_GUARD::QAR1(B),XQ(b)
      • Refutation
        • Q(b);XB(D)
    • Try
      • S(A);
      • Vars
        • Q(b);CHECK,N_GUARD::QAR2(B),XQ(b)
        • Q(b);N_GUARD::QAR1(B)
        • Q(b);SBLOCK::QAR1(B)
        • Q(b);N_GUARD::QAR1(B),XQ(b)
      • Refutation
        • Q(b);XB(D)
    • Try
      • S(A);
      • Vars
        • Q(b);CHECK,N_GUARD::QAR2(B),XQ(b)
        • Q(b);N_GUARD::QAR1(B)
        • Q(b);N_GUARD,P_PINP(C)::QAR1(B)
        • Q(b);N_GUARD::QAB1(B),XQ(b)
        • Q(b);N_GUARD::QAR1(B),XQ(b)
      • Refutation
        • Q(b);XB(D)
  • Actual
    • S(A);
    • Threat
      • QAR1(B)
    • Vars
      • Q(b);CHECK,N_GUARD::QAR2(B),XQ(b)
      • Q(b);N_GUARD::QAR1(B)
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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).