MESON Chess Problem Database

Problem Display
PID: 258980 (2B5/1N6/1n2RBPq/2pk1p1R/p1r4p/b4p1b/2P1PK2/1Q3N2 w - - 0 1)

Sommer, Bruno Oswald

Die Schwalbe, 1967

2B5/1N6/1n2RBPq/2pk1p1R/p1r4p/b4p1b/2P1PK2/1Q3N2

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qe3+
      • 2.Sxe3#
    • 1...Qg7
      • 2.Se3#
    • 1...Qf8
      • 2.Se3#
    • 1...Qxh5
      • 2.Se3#
    • 1...Qxg6
      • 2.Se3#
    • 1...Qh7
      • 2.Se3#
    • 1...Qh8
      • 2.Se3#
    • 1...Rf4
      • 2.Se3#
    • 1...Bxf1
      • 2.Rxf5#
    • 1...Bg2
      • 2.Rxf5#
  • Tries
    • 1.Qd1+?
      • 1...Qd2
        • 2.Se3#
      • 1...Rd4!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qc6#
      • 1...Qe3+
        • 2.Sxe3#
      • 1...Rxc2
        • 2.Qd3#
      • 1...Rc3
        • 2.e4#
      • 1...Rb4
        • 2.Qxc5#
      • 1...Rd4
        • 2.Re5#
      • 1...Re4
        • 2.Rd6#
      • 1...Rf4
        • 2.Se3#
      • 1...Rg4
        • 2.Rxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 8
  • Sets
    • Q(k);CHECK,N_GUARD::S(B),XQ(k)
    • Q(k);N_GUARD::S(B)
    • Q(k);N_GUARD,N_SPINP(i),XR(F)::S(B)
    • Q(k);N_GUARD,XP(I)::S(B)
    • R(e);S_CUTQ(k)::S(B)
    • B(c);N_GUARD,XS(B)::R(F),XP(i)
    • B(c);N_GUARD::R(F),XP(i)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • Q(k);P_PINP(D),P_SPINQ(k)::S(B)
      • Refutation
        • R(e);P_SPINR(e)
  • Actual
    • Q(A);N_PINP(i),P_PINP(g)
    • Threat
      • QAB1(A)
    • Vars
      • Q(k);CHECK,N_GUARD::S(B),XQ(k)
      • R(e);OGATE,P_PINP(D),XP(C)::QAR2(A)
      • R(e);N_GUARD::P(D)
      • R(e);N_GUARD,S_CUTB(a)::QAR1(A),XP(g)
      • R(e);SBLOCK::R1(G)
      • R(e);S_CUTQ(k)::S(B)
      • R(e);S_CUTB(c)::R(F),XP(i)
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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).