MESON Chess Problem Database

Problem Display
PID: 205741 (2KB2n1/2P1p3/3pk1Pn/8/3PB2b/6pN/6P1/5Q2 w - - 0 1)

Kaiser, Gerhard

1st Prize, Funkstunde, 1925

2KB2n1/2P1p3/3pk1Pn/8/3PB2b/6pN/6P1/5Q2

#2

9 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bg5
      • 2.Sxg5#
    • 1...Bf6
      • 2.Sf4#
    • 1...Sg4
      • 2.Qf5#
      • 2.Qf7#
    • 1...Sf5
      • 2.Qxf5#
    • 1...Sf7
      • 2.Qf5#
      • 2.Qxf7#
    • 1...Sf6
      • 2.Sf4#
    • 1...d5
      • 2.Qa6#
  • Tries
    • 1.Qc4+?
      • 1...d5
        • 2.Qa6#
        • 2.Qc6#
      • 1...Kf6!
    • 1.Qf3?
      • threat
        • 2.Bd5#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sf6
        • 2.Sf4#
      • 1...d5!
    • 1.Qf4?
      • threat
        • 2.d5#
      • 1...Sf5
        • 2.Qxf5#
      • 1...d5
        • 2.Qe5#
      • 1...Sf6!
    • 1.Qf6+?
      • 1...Bxf6
        • 2.Sf4#
      • 1...Sxf6
        • 2.Sf4#
      • 1...exf6
        • 2.Sf4#
      • 1...Kxf6!
    • 1.Qf8?
      • threat
        • 2.Sf4#
      • 1...Sf7
        • 2.Qxf7#
      • 1...Bg5
        • 2.Sxg5#
      • 1...d5!
  • Keys
    • 1.Qa1!
      • threat
        • 2.d5#
      • 1...Kf6
        • 2.d5#
      • 1...d5
        • 2.Qa6#
      • 1...Sf6
        • 2.Sf4#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • B(b);N_GUARD::S(C),XB(b)
    • B(b);SBLOCK::S(C)
    • S(e);N_GUARD::QAB1(A),XS(e)
    • S(g);SBLOCK::S(C)
    • P(c);OGATEB::QAR(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Refutation
        • K(d);P-FLIGHT,P_SPINP(f)
    • Try
      • Q(A);
      • Threat
        • B(E)
      • Vars
        • S(e);N_GUARD::QAB1(A),XS(e)
        • S(g);SBLOCK::S(C)
      • Refutation
        • P(c);
    • Try
      • Q(A);
      • Threat
        • P(D)
      • Vars
        • S(e);N_GUARD::QAB1(A),XS(e)
        • P(c);N_GUARD::QAR1(A)
      • Refutation
        • S(g);
    • Try
      • Q(A);CHECK
      • Vars
        • B(b);SBLOCK,XQ(A)::S(C)
        • S(g);SBLOCK,XQ(A)::S(C)
        • P(f);XQ(A)::S(C)
      • Refutation
        • K(d);P-FLIGHT,P_SPINP(f),XQ(A)
    • Try
      • Q(A);
      • Threat
        • S(C)
      • Vars
        • S(e);N_GUARD::QAB1(A),XS(e)
        • B(b);N_GUARD::S(C),XB(b)
      • Refutation
        • P(c);
  • Actual
    • Q(A);
    • Threat
      • P(D)
    • Vars
      • K(d);P-FLIGHT,P_SPINP(f)::QAB(A)+P(D)
      • P(c);OGATEB::QAR(A)
      • S(g);SBLOCK::S(C)
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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).