MESON Chess Problem Database

Problem Display
PID: 11613 (1K6/7B/pN2kP2/2B1p2Q/q1b4n/5R2/6r1/8 w - - 0 1)

Niemeijer, Meindert

Die Schwalbe, 1970

1K6/7B/pN2kP2/2B1p2Q/q1b4n/5R2/6r1/8

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1
      • 2.Qe8#
    • 1...Qc2
      • 2.Qe8#
    • 1...Qb3
      • 2.Qe8#
    • 1...Qe8+
      • 2.Qxe8#
    • 1...Qa1
      • 2.Qe8#
    • 1...Qa2
      • 2.Qe8#
    • 1...Qa3
      • 2.Qe8#
    • 1...Qb4
      • 2.Qe8#
    • 1...Qa5
      • 2.Qe8#
    • 1...Ra2
      • 2.Bg8#
    • 1...Rb2
      • 2.Bg8#
    • 1...Rc2
      • 2.Bg8#
    • 1...Rd2
      • 2.Bg8#
    • 1...Re2
      • 2.Bg8#
    • 1...Rf2
      • 2.Bg8#
    • 1...Rh2
      • 2.Bg8#
    • 1...Rg8+
      • 2.Bxg8#
    • 1...Sg6
      • 2.Bg8#
  • Tries
    • 1.Qxe5+?
      • 1...Kf7
        • 2.Qe7#
      • 1...Kxe5!
  • Keys
    • 1.f7!
      • threat
        • 2.f8S#
      • 1...Qe8+
        • 2.fxe8Q#
        • 2.fxe8R#
      • 1...Rg8+
        • 2.fxg8Q#
        • 2.fxg8B#
      • 1...Sxf3
        • 2.Qf5#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sg6
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 17
  • Sets
    • Q(b);N_GUARD::QAR2(C)
    • Q(b);N_GUARD,P_PINS(D)::QAR2(C)
    • Q(b);CHECK,N_GUARD::QAR2(C),XQ(b)
    • R(a);N_GUARD::B(F)
    • R(a);N_GUARD,P_PINS(D)::B(F)
    • R(a);CHECK,N_GUARD::B(F),XR(a)
    • S(d);S_CUTR(a)::B(F)
  • Tries
    • Try
      • Q(C);CHECK,XP(e)
      • Vars
        • K(g);OGATE,S_FLIGHT::QAR1(C)
      • Refutation
        • K(g);P-FLIGHT,XQ(C)
  • Actual
    • P(E);
    • Threat
      • P=S
    • Vars
      • Q(b);CHECK,OGATE::PXQ(b)=Q
      • R(a);CHECK,OGATE::PXR(a)=Q
      • S(d);N_GUARD,XR(A)::QAB1(C)
      • S(d);N_GUARD::QAB1(C),XS(d)
      • S(d);N_GUARD::QAB1(C)
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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).