MESON Chess Problem Database

Problem Display
PID: 265089 (2BB4/8/2pkp3/2RqR1p1/P1p1p1P1/2P1PP2/3N4/5Q1K w - - 0 1)

Racz, Erich

Die Schwalbe, 1971

2BB4/8/2pkp3/2RqR1p1/P1p1p1P1/2P1PP2/3N4/5Q1K

#2

12 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc5
      • 2.Sxe4#
    • 1...Kxe5
      • 2.Sxc4#
  • Tries
    • 1.Sxc4+?
      • 1...Kxc5
        • 2.Bb6#
        • 2.Be7#
      • 1...Qxc4!
    • 1.Sxe4+?
      • 1...Kxe5
        • 2.Bf6#
        • 2.Bc7#
      • 1...Qxe4!
    • 1.Qd1?
      • 1...Kxc5
        • 2.Sxe4#
      • 1...Kxe5
        • 2.Sxc4#
      • 1...Qxd2
        • 2.Qxd2#
      • 1...Qxc5
        • 2.Sxc4#
      • 1...Qxe5
        • 2.Sxe4#
      • 1...Qd3
        • 2.Sxc4#
        • 2.Sxe4#
      • 1...Qd4
        • 2.Sxc4#
        • 2.Sxe4#
      • 1...exf3!
  • Keys
    • 1.fxe4!
      • 1...Qxe4+
        • 2.Sxe4#
      • 1...Kxc5
        • 2.Qf8#
      • 1...Kxe5
        • 2.Bc7#
      • 1...Qxd2
        • 2.Qf8#
      • 1...Qxc5
        • 2.Rxe6#
      • 1...Qxe5
        • 2.Qf8#
      • 1...Qd3
        • 2.Qf8#
      • 1...Qd4
        • 2.Qf8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • K(f);N_GUARD,P_SPINQ(c),S_FLIGHT,XR(I)::S(C),XP(b)
    • K(f);N_GUARD,P_SPINQ(c),S_FLIGHT,XR(J)::S(C),XP(a)
  • Tries
    • Try
      • S(C);CHECK,XP(a)
      • Refutation
        • Q(c);XS(C)
    • Try
      • S(C);CHECK,XP(b)
      • Refutation
        • Q(c);P_PINP(F),XS(C)
    • Try
      • Q(A);
      • Vars
        • K(f);N_GUARD,P_SPINQ(c),S_FLIGHT,XR(I)::S(C),XP(b)
        • K(f);N_GUARD,P_SPINQ(c),S_FLIGHT,XR(J)::S(C),XP(a)
        • Q(c);OGATE,P_SPINQ(c),XS(C)::QAR(A),XQ(c)
        • Q(c);XR(I)::QAR(A)+S(C),DCHECK,XP(a)
        • Q(c);XR(J)::QAR(A)+S(C),DCHECK,XP(b)
      • Refutation
        • P(b);XP(F)
  • Actual
    • P(F);P_SPINP(F),XP(b)
    • Vars
      • Q(c);CHECK,XP(F)::S(C),XQ(c)
      • K(f);N_GUARD,P_SPINQ(c),S_FLIGHT,XR(I)::QAB(A)
      • K(f);N_GUARD,P_SPINQ(c),S_FLIGHT,XR(J)::B(L)
      • Q(c);N_PINP(F),XS(C)::QAB(A)
      • Q(c);N_GUARD,N_PINP(F),SBLOCK,XR(I)::R1(J),XP(g)
      • Q(c);N_PINP(F),XR(J)::QAB(A)
      • Q(c);N_PINP(F)::QAB(A)
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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).