MESON Chess Problem Database

Problem Display
PID: 67373 (B5R1/1r6/7P/q1p1p2p/2Q1Pk2/r3R2P/1P1PP3/2B4K w - - 0 1)

Heyl, Peter

Die Schwalbe, 2006

B5R1/1r6/7P/q1p1p2p/2Q1Pk2/r3R2P/1P1PP3/2B4K

#2

12 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Rf3#
    • 1...Ra2
      • 2.Rf3#
    • 1...Rxe3
      • 2.dxe3#
    • 1...Ra4
      • 2.Rf3#
    • 1...Rxb2
      • 2.Qf7#
    • 1...Rb3
      • 2.Qf7#
    • 1...Rb4
      • 2.Qf7#
    • 1...Rb5
      • 2.Qf7#
    • 1...Rf7
      • 2.Qxf7#
    • 1...Rb8
      • 2.Qf7#
    • 1...h4
      • 2.Rg4#
  • Tries
    • 1.Rxa3?
      • threat
        • 2.Rf3#
      • 1...Qxa3
        • 2.d3#
      • 1...Qc3
        • 2.dxc3#
      • 1...Rb3
        • 2.Qf7#
      • 1...Rg7!
    • 1.Qe6?
      • threat
        • 2.Qf5#
        • 2.Qf6#
      • 1...Rxe3
        • 2.Qf5#
      • 1...Qb6
        • 2.Qf5#
      • 1...Qd8
        • 2.Qf5#
      • 1...Qa6
        • 2.Qf5#
      • 1...Rb6
        • 2.Qf5#
      • 1...Rf7
        • 2.Qxf7#
      • 1...Qxd2!
  • Keys
    • 1.Rc3!
      • threat
        • 2.d3#
      • 1...Qxc3
        • 2.dxc3#
      • 1...Rxc3
        • 2.dxc3#
      • 1...Rxb2
        • 2.Qf7#
      • 1...Rg7
        • 2.d4#
      • 1...Ra1
        • 2.Rf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • R(a);N_GUARD,P_PINB(A)::R1(F)
    • R(a);N_GUARD::R1(F)
    • R(a);OGATE,XR(F)::P(D),XR(a)
    • R(g);N_GUARD,XP(C)::QAR(H)
    • R(g);N_GUARD::QAR(H)
    • R(g);N_GUARD::QAR(H),XR(g)
    • P(f);N_GUARD::R1(L)
  • Tries
    • Try
      • R(F);XR(a)
      • Threat
        • R1(F)
      • Vars
        • Q(c);N_GUARD,XR(F)::B(A)+P(D)
        • Q(c);OGATE::B(A)+P(D),XQ(c)
        • R(g);N_GUARD::QAR(H)
      • Refutation
        • R(g);
    • Try
      • Q(H);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);XR(F)::QAR1(H)
        • Q(c);::QAR1(H)
        • R(g);::QAR1(H)
        • R(g);N_GUARD::QAR(H),XR(g)
      • Refutation
        • Q(c);XP(D)
  • Actual
    • R(F);
    • Threat
      • B(A)+P(D)
    • Vars
      • Q(c);OGATE,XR(F)::B(A)+P(D),XQ(c)
      • R(a);OGATE,XR(F)::B(A)+P(D),XR(a)
      • R(g);N_GUARD,XP(C)::QAR(H)
      • R(g);::B(A)+P(D)
      • R(a);N_GUARD,P_PINB(A)::R1(F)
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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).