MESON Chess Problem Database

Problem Display
PID: 91873 (1q1r4/8/b4Q2/4n1R1/1BPkp3/1PN1p1K1/1P6/1nbN1B2 w - - 0 1)

Ferreau, Wilhelm

Deutsche Schachblatter, 1938

1q1r4/8/b4Q2/4n1R1/1BPkp3/1PN1p1K1/1P6/1nbN1B2

#2

10 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa7
      • 2.Qxe5#
    • 1...Qxb4
      • 2.Qxe5#
    • 1...Qb6
      • 2.Qxe5#
      • 2.Qxb6#
    • 1...Qb7
      • 2.Qxe5#
    • 1...Qa8
      • 2.Qxe5#
      • 2.Qb6#
    • 1...Qc8
      • 2.Qxe5#
    • 1...Rd6
      • 2.Qxe5#
    • 1...Bb7
      • 2.Sb5#
      • 2.Qb6#
    • 1...Sxc3
      • 2.bxc3#
  • Keys
    • 1.Qf4!
      • threat
        • 2.Qxe4#
      • 1...Qxb4
        • 2.Qxe5#
      • 1...Sxc3
        • 2.bxc3#
      • 1...Sxc4
        • 2.Bc5#
      • 1...Qb7
        • 2.Qxe5#
      • 1...Qa8
        • 2.Qxe5#
      • 1...Bb7
        • 2.Sb5#
      • 1...Sd2
        • 2.Qxe3#
      • 1...Sd3
        • 2.Se2#
      • 1...Sf3
        • 2.Bc5#
      • 1...Sg4
        • 2.Bc5#
      • 1...Sc6
        • 2.Bc5#
      • 1...Sg6
        • 2.Bc5#
      • 1...Sd7
        • 2.Rd5#
      • 1...Sf7
        • 2.Bc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 11
    • REMOVED MATES = 3
  • Sets
    • Q(h);N_GUARD::QAB1(J),XS(f)
    • Q(h);N_GUARD,XB(G)::QAB1(J),XS(f)
    • R(i);S_CUTQ(h)::QAB1(J),XS(f)
    • S(a);OGATE,XS(E)::P(C),XS(a)
  • Actual
    • Q(J);N_PINS(f),P_PINP(e)
    • Threat
      • QAR1(J),XP(e)
    • Vars
      • Q(h);N_GUARD,XB(G)::QAB1(J),XS(f)
      • S(a);OGATE,XS(E)::P(C),XS(a)
      • S(f);P_PINQ(J),XP(H)::B(G)
      • Q(h);N_GUARD::QAB1(J),XS(f)
      • B(g);N_GUARD,S_CUTQ(h)::S(E)
      • S(a);S_CUTB(b)::QAB1(J),XP(c)
      • S(f);P_PINQ(J),SBLOCK::S(E)
      • S(f);P_PINQ(J)::B(G)
      • S(f);OGATE,P_PINQ(J)::R1(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).