MESON Chess Problem Database

Problem Display
PID: 287499 (3R4/1b2p1B1/B2q2QK/2p1r3/2PknR1p/1P5r/3P3N/2N5 w - - 0 1)

Philipowitz, Martin

Die Schwalbe, 1935

3R4/1b2p1B1/B2q2QK/2p1r3/2PknR1p/1P5r/3P3N/2N5

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Rxe4#
      • 2.Qxe4#
    • 1...Rd3
      • 2.Se2#
    • 1...Rf3
      • 2.Sxf3#
    • 1...Bxa6
      • 2.Rxe4#
    • 1...Bc8
      • 2.Rxe4#
  • Tries
    • 1.Rxd6+?
      • 1...Bd5
        • 2.Rxe4#
        • 2.Rxd5#
        • 2.Qxe4#
      • 1...exd6!
    • 1.Qxd6+?
      • 1...Bd5
        • 2.Bxe5#
        • 2.Qxe5#
        • 2.Qxd5#
      • 1...exd6!
  • Keys
    • 1.Rf3!
      • threat
        • 2.Se2#
      • 1...Rxh2
        • 2.Rd3#
      • 1...Rxf3
        • 2.Sxf3#
      • 1...Sc3
        • 2.dxc3#
      • 1...Sg3
        • 2.Rd3#
      • 1...Sf6
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • R(a);SBLOCK::S(A)
    • R(a);N_GUARD::S(C),XR(a)
    • B(h);N_GUARD,XB(G)::R1(F),XS(c)
    • B(h);N_GUARD::R1(F),XS(c)
  • Tries
    • Try
      • R(K);CHECK,N_SPINQ(H),XQ(g)
      • Refutation
        • P(i);XR(K)
    • Try
      • Q(H);CHECK,N_SPINQ(H),XQ(g)
      • Refutation
        • P(i);P_SPINP(i),XQ(H)
  • Actual
    • R(F);N_PINS(c)
    • Threat
      • S(A)
    • Vars
      • R(a);N_GUARD,XS(C)::R1(F)
      • R(a);XR(F)::S(C),XR(a)
      • S(c);OGATE::P(B),XS(c)
      • S(c);S_CUTR(a)::R1(F)
      • S(c);N_PINQ(H),N_SPINR(f)::QAR1(H)
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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).