MESON Chess Problem Database

Problem Display
PID: 21406 (8/1BQ5/7R/8/7n/2K3p1/6Rq/7k w - - 0 1)

Havel, Miroslav

Svetozor, 1918

8/1BQ5/7R/8/7n/2K3p1/6Rq/7k

#2

5 + 4

6024 Bohemian Garnets 1923
5501 Chess Cameos 1936

SOLUTION

  • SOUND
  • Sets
    • 1...Sf5
      • 2.Rxg3#
    • 1...Sg6
      • 2.Rxg3#
  • Tries
    • 1.Rxh4?
      • threat
        • 2.Rxg3#
      • 1...Qh3
        • 2.Rxh3#
      • 1...Qxh4!
    • 1.Qxg3?
      • threat
        • 2.Rg1#
        • 2.Rxh2#
        • 2.Qxh2#
      • 1...Qxg2
        • 2.Qxg2#
      • 1...Sxg2
        • 2.Qe1#
        • 2.Qxh2#
        • 2.Qxg2#
      • 1...Qg1
        • 2.Rxg1#
        • 2.Rh2#
      • 1...Qh3
        • 2.Rg1#
        • 2.Rh2#
        • 2.Qxh3#
      • 1...Sf3
        • 2.Rg1#
        • 2.Rgxh2#
      • 1...Qxg3+!
    • 1.Qc5?
      • threat
        • 2.Rg1#
      • 1...Qxg2
        • 2.Rxh4#
      • 1...Qg1
        • 2.Qxg1#
      • 1...Qh3
        • 2.Qg1#
      • 1...Sxg2!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Rg1#
      • 1...Qxg2
        • 2.Rxh4#
      • 1...Sxg2
        • 2.Qb1#
      • 1...Qg1
        • 2.Qxg1#
      • 1...Qh3
        • 2.Qg1#
        • 2.Qb1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(d);N_GUARD,P_SPINQ(b)::B(D)+R(A),XP(c)
  • Tries
    • Try
      • R(C);P_PINQ(b),XS(d)
      • Threat
        • B(D)+R(A),XP(c)
      • Vars
        • Q(b);OGATEB::R(C),XQ(b)
      • Refutation
        • Q(b);N_SPINQ(b),XR(C)
    • Try
      • Q(E);XP(c)
      • Threat
        • DUALS(3)
      • Vars
        • Q(b);OGATE,P_SPINQ(b),P_SPINS(d),XR(A)::QAB1(E),XQ(b)
      • Refutation
        • Q(b);CHECK,P_SPINS(d),XQ(E)
    • Try
      • Q(E);
      • Threat
        • B(D)+R(A),DCHECK
      • Vars
        • Q(b);OGATEB,P_SPINQ(b),P_SPINS(d),XR(A)::R(C),XS(d)
        • Q(b);N_GUARD,P_SPINS(d)::QAR1(E),XQ(b)
        • Q(b);N_GUARD::QAR1(E)
      • Refutation
        • S(d);P_SPINQ(b),P_SPINS(d),XR(A)
  • Actual
    • Q(E);
    • Threat
      • B(D)+R(A),DCHECK
    • Vars
      • Q(b);OGATEB,P_SPINQ(b),P_SPINS(d),XR(A)::R(C),XS(d)
      • S(d);P_SPINQ(b),P_SPINS(d),XR(A)::QAR(E)
      • Q(b);N_GUARD,P_SPINS(d)::QAR1(E),XQ(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).