MESON Chess Problem Database

Problem Display
PID: 71554 (b1B1K3/2pN3p/np4nR/1qpk1p2/Qp6/1P2R3/2P1N2B/4r3 w - - 0 1)

Segers, Marcel

Die Schwalbe, 1930

b1B1K3/2pN3p/np4nR/1qpk1p2/Qp6/1P2R3/2P1N2B/4r3

#2

10 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3
      • 2.Sf6#
    • 1...Qc4
      • 2.Sf6#
    • 1...Qxd7+
      • 2.Qxd7#
    • 1...Qa5
      • 2.Sf6#
    • 1...Sf4
      • 2.Re5#
    • 1...Sh4
      • 2.Re5#
    • 1...Se5
      • 2.Rxe5#
    • 1...Se7
      • 2.Re5#
    • 1...Sf8
      • 2.Re5#
    • 1...Sh8
      • 2.Re5#
    • 1...c6
      • 2.Sf6#
  • Tries
    • 1.Bb7+?
      • 1...Qc6
        • 2.Qxc6#
      • 1...c6
        • 2.Sf6#
      • 1...Bxb7!
    • 1.c4+?
      • 1...Kc6
        • 2.Re6#
        • 2.Qxb5#
      • 1...Qxc4
        • 2.Sf6#
      • 1...bxc4 ep!
  • Keys
    • 1.Rd3+!
      • 1...Ke4
        • 2.Sc3#
      • 1...Kc6
        • 2.Se5#
      • 1...Ke6
        • 2.Sf4#
      • 1...Qxd3
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 10
  • Sets
    • Q(c);N_PINS(H)::S(H)
    • Q(c);CHECK,OGATE,XS(H)::QAR2(F),XQ(c)
    • S(i);N_GUARD::R1(E)
    • S(i);N_GUARD::R1(E),XS(i)
    • P(j);N_PINS(H),SBLOCK::S(H)
  • Tries
    • Try
      • B(I);CHECK
      • Vars
        • Q(c);OGATE,P_SPINQ(c)::QAB1(F),XQ(c)
        • P(j);N_PINS(H),P_SPINP(j)::S(H)
      • Refutation
        • B(l);XB(I)
    • Try
      • P(A);CHECK
      • Vars
        • Q(c);N_PINS(H),XP(A)::S(H)
      • Refutation
        • P(b);EP,XP(A)
  • Actual
    • R(E);CHECK,N_SPINS(H),P_SPINS(B)
    • Vars
      • K(e);N_PINS(B),P_PINS(H),P_SPINP(b),S_FLIGHT::S(B)
      • K(e);P_SPINQ(c),P_SPINS(i),S_FLIGHT::S(H)
      • K(e);N_PINS(B),P_PINS(H),P_SPINS(i),S_FLIGHT::S(B)
      • Q(c);XR(E)::S(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).