MESON Chess Problem Database

Problem Display
PID: 267129 (1nn5/1Nq1p3/4R3/1k6/2N5/1PK2B2/8/5Q2 w - - 0 1)

Haring, Jacobus

The Problemist, 1955

1nn5/1Nq1p3/4R3/1k6/2N5/1PK2B2/8/5Q2

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qh2
      • 2.Sa3#
    • 1...Qg3
      • 2.Sb2#
      • 2.Sd2#
      • 2.Sa3#
      • 2.Se3#
      • 2.Sca5#
      • 2.Se5#
      • 2.Sb6#
    • 1...Qf4
      • 2.Sa3#
    • 1...Qa5+
      • 2.Scxa5#
    • 1...Qe5+
      • 2.Sxe5#
    • 1...Qb6
      • 2.Sb2#
      • 2.Sd2#
      • 2.Sa3#
      • 2.Se3#
      • 2.Sca5#
      • 2.Se5#
      • 2.Sxb6#
      • 2.Scd6#
    • 1...Qd8
      • 2.Sa3#
    • 1...Qxc4+
      • 2.Qxc4#
    • 1...Qd7
      • 2.Sa3#
  • Tries
    • 1.Rb6+?
      • 1...Qxb6
        • 2.Sb2#
        • 2.Sd2#
        • 2.Sa3#
        • 2.Se3#
        • 2.Sca5#
        • 2.Se5#
        • 2.Scd6#
      • 1...Sxb6!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qa4#
      • 1...Qa5+
        • 2.Qxa5#
      • 1...Qe5+
        • 2.Rxe5#
      • 1...Qxc4+
        • 2.bxc4#
      • 1...Qxb7
        • 2.Qa5#
      • 1...Sb6
        • 2.Qa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(b);N_PINS(E)::QAB(A)+S(E),DCHECK
    • Q(b);CHECK,N_PINS(E)::QAB(A)+S(E),XQ(b)
    • Q(b);CHECK,OGATE,P_SPINQ(b),XS(E)::QAB1(A),XQ(b)
  • Tries
    • Try
      • R(F);CHECK
      • Refutation
        • S(e);XR(F)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • Q(b);CHECK,N_GUARD,N_PINS(E)::QAR1(A),XQ(b)
      • Q(b);CHECK,N_GUARD,N_PINS(E)::R(F),XQ(b)
      • Q(b);CHECK,OGATE,XS(E)::P(B),XQ(b)
      • Q(b);N_GUARD,N_PINS(E),XS(G)::QAR1(A)
      • S(e);S_CUTQ(b)::QAR1(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).