MESON Chess Problem Database

Problem Display
PID: 90202 (3Nbk2/2PppP1p/2Pp3P/3NP1K1/1Q6/B7/8/8 w - - 0 1)

van Woerden, Jan

Die Schwalbe, 1995

3Nbk2/2PppP1p/2Pp3P/3NP1K1/1Q6/B7/8/8

#2

10 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...dxe5
      • 2.Qxe7#
    • 1...e6
      • 2.Qxd6#
  • Tries
    • 1.Sf4?
      • 1...dxe5
        • 2.Qxe7#
      • 1...dxc6
        • 2.Sfe6#
      • 1...e6
        • 2.Qxd6#
      • 1...d5
        • 2.Qxe7#
      • 1...Bxf7!
    • 1.Qxd6?
      • threat
        • 2.Qxe7#
      • 1...exd6
        • 2.Bxd6#
      • 1...Bxf7!
    • 1.Qb8?
      • 1...Bxf7
        • 2.Se6#
      • 1...dxe5
        • 2.Bxe7#
      • 1...e6
        • 2.Bxd6#
      • 1...dxc6!
    • 1.c8Q?
      • 1...Bxf7
        • 2.Se6#
      • 1...dxe5
        • 2.Qxe7#
      • 1...e6
        • 2.Qxd6#
      • 1...dxc6!
    • 1.c8R?
      • 1...Bxf7
        • 2.Se6#
      • 1...dxe5
        • 2.Qxe7#
      • 1...e6
        • 2.Qxd6#
      • 1...dxc6!
  • Keys
    • 1.Qf4!
      • 1...Bxf7
        • 2.Qxf7#
      • 1...dxe5
        • 2.Bxe7#
      • 1...dxc6
        • 2.Se6#
      • 1...e6
        • 2.Bxd6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATE,P_SPINP(c),XP(D)::QAB1(B),XP(c)
    • P(c);OGATEB,P_SPINP(a)::QAB(B),XP(a)
  • Tries
    • Try
      • S(C);
      • Vars
        • P(a);OGATE,P_SPINP(c),XP(D)::QAB1(B),XP(c)
        • P(b);N_GUARD,XP(F)::S(C)
        • P(c);OGATEB,P_SPINP(a)::QAB(B),XP(a)
        • P(a);OGATE,P_SPINP(c)::QAB1(B),XP(c)
      • Refutation
        • B(e);XP(I)
    • Try
      • Q(B);P_PINP(c),XP(a)
      • Threat
        • QAB1(B),XP(c)
      • Vars
        • P(c);OGATE,XQ(B)::B(A),XP(c)
      • Refutation
        • B(e);XP(I)
    • Try
      • Q(B);
      • Vars
        • B(e);SBLOCK,XP(I)::QAR(B)+S(J),DCHECK
        • P(a);OGATE,P_SPINP(c),XP(D)::B(A),XP(c)
        • P(c);OGATEB,P_SPINP(a)::B(A),XP(a)
      • Refutation
        • P(b);XP(F)
    • Try
      • P(H);
      • Vars
        • B(e);SBLOCK,XP(I)::QAR(H)+S(J),DCHECK
        • P(a);OGATE,P_SPINP(c),XP(D)::QAB1(B),XP(c)
        • P(c);OGATEB,P_SPINP(a)::QAB(B),XP(a)
      • Refutation
        • P(b);XP(F)
    • Try
      • P(H);
      • Vars
        • B(e);SBLOCK,XP(I)::R(H)+S(J),DCHECK
        • P(a);OGATE,P_SPINP(c),XP(D)::QAB1(B),XP(c)
        • P(c);OGATEB,P_SPINP(a)::QAB(B),XP(a)
      • Refutation
        • P(b);XP(F)
  • Actual
    • Q(B);
    • Vars
      • B(e);OGATE,P_SPINB(e),XP(I)::QAR1(B),XB(e)
      • P(a);OGATE,P_SPINP(c),XP(D)::B(A),XP(c)
      • P(b);N_GUARD,XP(F)::S(J)
      • P(c);OGATEB,P_SPINP(a)::B(A),XP(a)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).