MESON Chess Problem Database

Problem Display
PID: 222766 (1bR2q2/1P1k1P2/1n1P2r1/8/1Nn1R3/8/K3B3/3Q4 w - - 0 1)

Bettmann, Henry Wald

Tidskrift for Schack, 1910

1bR2q2/1P1k1P2/1n1P2r1/8/1Nn1R3/8/K3B3/3Q4

#2

9 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd6
      • 2.f8S#
    • 1...Qh6
      • 2.Re7#
    • 1...Qe7
      • 2.Rxe7#
    • 1...Qg7
      • 2.Re7#
    • 1...Qe8
      • 2.fxe8Q#
      • 2.fxe8B#
    • 1...Qg8
      • 2.Re7#
    • 1...Qh8
      • 2.Re7#
    • 1...Rg4
      • 2.Bxg4#
    • 1...Rxd6
      • 2.Bg4#
    • 1...Sb2
      • 2.Bb5#
    • 1...Se3
      • 2.Bb5#
    • 1...Sxd6
      • 2.Bb5#
  • Tries
    • 1.Bg4+?
      • 1...Re6
        • 2.Bxe6#
      • 1...Rxg4!
    • 1.Rc7+?
      • 1...Kd8
        • 2.Sc6#
      • 1...Bxc7!
    • 1.Qa4+?
      • 1...Kxd6
        • 2.Qc6#
      • 1...Sxa4!
  • Keys
    • 1.Ree8!
      • threat
        • 2.Rcd8#
      • 1...Qxd6
        • 2.f8S#
      • 1...Qxe8
        • 2.fxe8Q#
      • 1...Rxd6
        • 2.Bg4#
      • 1...Bxd6
        • 2.b8S#
      • 1...Sxd6
        • 2.Bb5#
      • 1...Sxc8
        • 2.bxc8Q#
        • 2.bxc8B#
      • 1...Qe7
        • 2.Rxe7#
      • 1...Bc7
        • 2.Rxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • Q(f);OGATE,P_SPINQ(f),XP(F)::P=S
    • Q(f);N_GUARD::R1(E)
    • Q(f);N_GUARD::R1(E),XQ(f)
    • Q(f);OGATE::PXQ(f)=Q
    • R(c);N_GUARD::B(C),XR(c)
    • R(c);N_GUARD,P_SPINR(c),XP(F)::B(C)
    • S(a);OGATE::B(C)
    • S(a);OGATE,P_SPINS(a),XP(F)::B(C)
  • Tries
    • Try
      • B(C);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::B(C),XR(c)
      • Refutation
        • R(c);XB(C)
    • Try
      • R(I);CHECK
      • Vars
        • K(d);P-FLIGHT::S(D)
      • Refutation
        • B(e);XR(I)
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);P-FLIGHT,XP(F)::QAR1(A)
      • Refutation
        • S(b);XQ(A)
  • Actual
    • R(E);
    • Threat
      • R1(I)
    • Vars
      • Q(f);OGATE,P_SPINQ(f),XP(F)::P=S
      • Q(f);OGATE,XR(E)::PXQ(f)=Q
      • R(c);N_GUARD,P_SPINR(c),XP(F)::B(C)
      • B(e);OGATE,P_SPINB(e),XP(F)::P=S
      • S(a);OGATE,P_SPINS(a),XP(F)::B(C)
      • S(b);OGATE,XR(I)::PXS(b)=Q
      • Q(f);N_GUARD::R1(E),XQ(f)
      • B(e);N_GUARD::R1(I),XB(e)
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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).