MESON Chess Problem Database

Problem Display
PID: 6841 (6NK/3prP1P/N2k2BR/1P1P1P1P/3Qp2p/4p1rp/4P2B/8 w - - 0 1)

Rago, Istvan Stefano

Budapesti Sakkujsag, 1934

6NK/3prP1P/N2k2BR/1P1P1P1P/3Qp2p/4p1rp/4P2B/8

#2

14 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Re5
      • 2.Qc5#
    • 1...Re6
      • 2.dxe6#
    • 1...Rxf7
      • 2.Bxf7#
    • 1...Re8
      • 2.fxe8S#
  • Tries
    • 1.Kg7?
      • 1...Re5
        • 2.Qc5#
      • 1...Re6
        • 2.dxe6#
      • 1...Re8
        • 2.fxe8S#
      • 1...Rxf7+!
    • 1.Bxg3+?
      • 1...Re5
        • 2.Bxe5#
        • 2.Qc5#
        • 2.Qxe5#
        • 2.f8Q#
        • 2.f8B#
      • 1...hxg3!
    • 1.Qb6+?
      • 1...Kxd5
        • 2.Qc5#
      • 1...Ke5!
    • 1.Qb4+?
      • 1...Kxd5
        • 2.Qc5#
      • 1...Ke5!
    • 1.b6?
      • 1...Rxf7
        • 2.Bxf7#
      • 1...Re5
        • 2.Qc5#
      • 1...Re8
        • 2.fxe8S#
      • 1...Re6!
    • 1.f8S?
      • 1...Rxh7+
        • 2.Bxh7#
      • 1...Re6
        • 2.dxe6#
      • 1...Re5
        • 2.Qc5#
      • 1...Rf7
        • 2.Bxf7#
      • 1...Re8
        • 2.Bxe8#
      • 1...Rg7!
  • Keys
    • 1.f8R!
      • 1...Rxh7+
        • 2.Bxh7#
      • 1...Re6
        • 2.dxe6#
      • 1...Re5
        • 2.Qc5#
      • 1...Rf7
        • 2.Bxf7#
      • 1...Rg7
        • 2.Rf6#
      • 1...Re8
        • 2.Bxe8#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(h);N_SPINR(b),SBLOCK::QAB1(C)
    • R(h);OGATE::QAR(C)+P(E),XR(h)
    • R(h);OGATE,XP(K)::R(J)+B(I),XR(h)
    • R(h);OGATE,P_PINS(M)::PXR(h)=S
  • Tries
    • Try
      • K(N);P_SPINB(I),P_SPINP(K),S_FLIGHT
      • Vars
        • R(h);N_PINP(K),N_SPINR(b),SBLOCK::QAB1(C)
        • R(h);N_PINP(K),OGATE::QAR(C)+P(E),XR(h)
        • R(h);N_PINP(K)::PXR(h)=S
      • Refutation
        • R(h);CHECK,XP(K)
    • Try
      • B(B);CHECK,XR(b)
      • Refutation
        • P(e);XB(B)
    • Try
      • Q(C);CHECK
      • Vars
        • K(f);N_SPINR(b),P-FLIGHT,XP(E)::QAR1(C)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(f);N_SPINR(b),P-FLIGHT,XP(E)::QAR1(C)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • P(D);
      • Vars
        • R(h);OGATE,XP(K)::R(J)+B(I),XR(h)
        • R(h);N_SPINR(b),SBLOCK::QAB1(C)
        • R(h);OGATE,P_PINS(M)::PXR(h)=S
      • Refutation
        • R(h);
    • Try
      • P(K);
      • Vars
        • R(h);CHECK,OGATE,XP(L)::R(J)+B(I),XR(h)
        • R(h);OGATE::QAR(C)+P(E),XR(h)
        • R(h);N_SPINR(b),SBLOCK::QAB1(C)
        • R(h);N_GUARD::R(J)+B(I),XR(h)
      • Refutation
        • R(h);
  • Actual
    • P(K);
    • Vars
      • R(h);CHECK,OGATE,XP(L)::R(J)+B(I),XR(h)
      • R(h);OGATE::QAR(C)+P(E),XR(h)
      • R(h);N_SPINR(b),SBLOCK::QAB1(C)
      • R(h);N_GUARD::R(J)+B(I),XR(h)
      • R(h);N_GUARD::R(K)
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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).