MESON Chess Problem Database

Problem Display
PID: 89913 (8/6Nn/5n2/4Q3/6pk/8/6K1/8 w - - 0 1)

Lokker, Miklosh S

Die Schwalbe, 1968

8/6Nn/5n2/4Q3/6pk/8/6K1/8

#2

3 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Se4
      • 2.Qh5#
    • 1...Sd5
      • 2.Qh5#
    • 1...Sh5
      • 2.Qxh5#
    • 1...Sd7
      • 2.Qh5#
    • 1...Se8
      • 2.Qh5#
    • 1...Sg8
      • 2.Qh5#
    • 1...Sg5
      • 2.Qg3#
    • 1...Sf8
      • 2.Qxf6#
    • 1...g3
      • 2.Qxg3#
  • Tries
    • 1.Se6?
      • threat
        • 2.Qh2#
      • 1...Sg5
        • 2.Qxg5#
      • 1...g3!
    • 1.Qf4?
      • 1...Se4
        • 2.Qh6#
      • 1...Sd5
        • 2.Qh6#
      • 1...Sh5
        • 2.Sf5#
      • 1...Sd7
        • 2.Qh6#
      • 1...Se8
        • 2.Qh6#
      • 1...Sg5
        • 2.Qg3#
      • 1...Sf8
        • 2.Qxf6#
      • 1...Sg8!
    • 1.Qxf6+?
      • 1...Sg5
        • 2.Qh6#
      • 1...Sxf6!
    • 1.Qe1+?
      • 1...g3
        • 2.Qxg3#
      • 1...Kg5!
  • Keys
    • 1.Kh2!
      • 1...g3+
        • 2.Qxg3#
      • 1...Se4
        • 2.Qh5#
      • 1...Sd5
        • 2.Qh5#
      • 1...Sh5
        • 2.Qxh5#
      • 1...Sd7
        • 2.Qh5#
      • 1...Se8
        • 2.Qh5#
      • 1...Sg8
        • 2.Qh5#
      • 1...Sg5
        • 2.Qg3#
      • 1...Sf8
        • 2.Qxf6#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::QAR1(B)
    • S(c);N_GUARD::QAR1(B),XS(c)
    • S(d);SBLOCK::QAB1(B)
    • S(d);N_GUARD::QAB(B),XS(c)
    • P(a);::QAB1(B),XP(a)
  • Tries
    • Try
      • S(C);
      • Threat
        • QAR2(B)
      • Vars
        • S(d);N_GUARD::QAB1(B),XS(d)
      • Refutation
        • P(a);
    • Try
      • Q(B);P_PINP(a)
      • Vars
        • S(c);N_GUARD::QAR2(B)
        • S(c);SBLOCK::S(C)
        • S(d);SBLOCK::QAB1(B)
        • S(d);N_GUARD::QAB(B),XS(c)
      • Refutation
        • S(c);
    • Try
      • Q(B);CHECK,XS(c)
      • Vars
        • S(d);P_SPINS(d)::QAR2(B)
      • Refutation
        • S(d);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • P(a);P_SPINP(a)::QAB1(B),XP(a)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • K(A);P-FLIGHT
    • Vars
      • P(a);CHECK::QAB1(B),XP(a)
      • S(c);N_GUARD::QAR1(B)
      • S(c);N_GUARD::QAR1(B),XS(c)
      • S(d);SBLOCK::QAB1(B)
      • S(d);N_GUARD::QAB(B),XS(c)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).