MESON Chess Problem Database

Problem Display
PID: 261689 (7k/1n6/2Q1n1R1/8/8/8/5K1p/8 w - - 0 1)

Burda, Josef

Sachove umeni (Ceskoslovensky sach), 2020

7k/1n6/2Q1n1R1/8/8/8/5K1p/8

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...h1Q
      • 2.Qxh1#
    • 1...h1S+
      • 2.Qxh1#
    • 1...h1B
      • 2.Qxh1#
    • 1...h1R
      • 2.Qxh1#
  • Tries
    • 1.Qxb7?
      • 1...h1S+
        • 2.Qxh1#
      • 1...Sg7
        • 2.Qxg7#
      • 1...h1Q
        • 2.Qxh1#
      • 1...h1B
        • 2.Qxh1#
      • 1...h1R
        • 2.Qxh1#
      • 1...Sd4
        • 2.Qg7#
      • 1...Sf4
        • 2.Qg7#
      • 1...Sc5
        • 2.Qg7#
      • 1...Sg5
        • 2.Qg7#
      • 1...Sd8
        • 2.Qg7#
      • 1...Sf8
        • 2.Qg7#
      • 1...Sc7!
    • 1.Qe8+?
      • 1...Kh7
        • 2.Qg8#
      • 1...Sf8!
    • 1.Qc3+?
      • 1...Sd4
        • 2.Qh3#
      • 1...Sg7
        • 2.Qxg7#
      • 1...Kh7!
    • 1.Qxe6?
      • threat
        • 2.Qh3#
        • 2.Qg8#
      • 1...Kh7
        • 2.Qg8#
      • 1...h1Q
        • 2.Qg8#
      • 1...h1R
        • 2.Qg8#
      • 1...h1S+!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qh5#
      • 1...h1S+
        • 2.Qxh1#
      • 1...Kh7
        • 2.Qh5#
      • 1...h1Q
        • 2.Qxh1#
      • 1...h1R
        • 2.Qxh1#
      • 1...Sf4
        • 2.Qg8#
      • 1...Sg5
        • 2.Qg8#
      • 1...Sg7
        • 2.Rh6#
      • 1...Sf8
        • 2.Qg8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • P(a);OGATEB::QAB(B),XQ(a)
    • P(a);CHECK,OGATEB::QAB(B),XS(a)
    • P(a);OGATEB::QAB(B),XB(a)
    • P(a);OGATEB::QAB(B),XR(a)
  • Tries
    • Try
      • Q(B);XS(c)
      • Vars
        • P(a);CHECK,OGATEB::QAB(B),XS(a)
        • S(b);N_GUARD::QAB1(B),XS(b)
        • P(a);OGATEB::QAB(B),XQ(a)
        • P(a);OGATEB::QAB(B),XB(a)
        • P(a);OGATEB::QAB(B),XR(a)
        • S(b);N_GUARD::QAB1(B)
      • Refutation
        • S(b);
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);P-FLIGHT::QAB1(B)
      • Refutation
        • S(b);P_SPINS(b)
    • Try
      • Q(B);CHECK
      • Vars
        • S(b);P_SPINS(b)::QAR(B)
        • S(b);N_GUARD,P_SPINS(b)::QAB1(B),XS(b)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(B);XS(b)
      • Threat
        • DUALS(2)
      • Vars
        • K(d);P-FLIGHT::QAB1(B)
        • P(a);::QAR1(B)
      • Refutation
        • P(a);CHECK
  • Actual
    • Q(B);
    • Threat
      • QAR(B)
    • Vars
      • P(a);CHECK,OGATEB::QAB(B),XS(a)
      • K(d);P-FLIGHT::QAR2(B)
      • P(a);OGATEB::QAB(B),XQ(a)
      • P(a);OGATEB::QAB(B),XR(a)
      • S(b);OGATE::QAR1(B)
      • S(b);SBLOCK::R(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).