MESON Chess Problem Database

Problem Display
PID: 254463 (2K2BB1/2p2R2/2P1p3/NpPkqbNR/3Pp3/4p3/8/3Q4 w - - 0 1)

Weisser, Berthold

Die Schwalbe, 1930

2K2BB1/2p2R2/2P1p3/NpPkqbNR/3Pp3/4p3/8/3Q4

#2

11 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4
      • 2.Rxf5#
    • 1...Qf6
      • 2.Rd7#
    • 1...Qh8
      • 2.Rd7#
  • Tries
    • 1.Sf3?
      • threat
        • 2.Qb3#
        • 2.dxe5#
      • 1...Qxd4
        • 2.Rfxf5#
        • 2.Rd7#
        • 2.Qxd4#
      • 1...Qh2
        • 2.Qb3#
      • 1...Qg3
        • 2.Qb3#
      • 1...Qf4
        • 2.Qb3#
      • 1...Qd6
        • 2.Qb3#
      • 1...Qf6
        • 2.Rd7#
        • 2.Qb3#
      • 1...Qg7
        • 2.Qb3#
      • 1...Qh8
        • 2.Rd7#
        • 2.Qb3#
      • 1...e2
        • 2.Qb3#
      • 1...exf3!
    • 1.Rxf5?
      • threat
        • 2.Bxe6#
        • 2.Rxe5#
        • 2.dxe5#
      • 1...e2
        • 2.Bxe6#
        • 2.Rxe5#
      • 1...Qxf5!
  • Keys
    • 1.Sxe6!
      • threat
        • 2.Qb3#
      • 1...Qxe6+
        • 2.Rd7#
      • 1...Bxe6+
        • 2.Rd7#
      • 1...Kxe6
        • 2.Rfxf5#
      • 1...Qxd4
        • 2.Rfxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(e);OGATEB,P_SPINQ(e),XP(B)::R(H),XB(f)
    • Q(e);N_GUARD::R(H)
  • Tries
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);P_SPINB(f)::QAB(A)
        • P(a);::QAB(A)
      • Refutation
        • P(b);XS(E)
    • Try
      • R(H);P_PINP(g),P_PINQ(e),XB(f)
      • Threat
        • DUALS(3)
      • Refutation
        • Q(e);N_SPINQ(e),XR(H)
  • Actual
    • S(E);P_SPINS(E),XP(g)
    • Threat
      • QAB(A)
    • Vars
      • Q(e);CHECK,N_GUARD,P_SPINB(f),XS(E)::R(H)
      • B(f);CHECK,P_SPINQ(e),XS(E)::R(H)
      • K(d);OGATEB,S_FLIGHT,XS(E)::B(K)+R(H),XB(f)
      • Q(e);OGATEB,P_SPINB(f),P_SPINQ(e),XP(B)::R(H),XB(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).