MESON Chess Problem Database

Problem Display
PID: 168263 (8/3NK1p1/1N2B3/8/1r1Bk3/1n1pn3/5R2/Q7 w - - 0 1)

Petite, Efren

Die Schwalbe, 1955

8/3NK1p1/1N2B3/8/1r1Bk3/1n1pn3/5R2/Q7

#2

7 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sc1
      • 2.Sc5#
    • 1...Sd2
      • 2.Sc5#
    • 1...Sa5
      • 2.Sc5#
    • 1...Sc5
      • 2.Sxc5#
    • 1...Sd1
      • 2.Bd5#
      • 2.Bf5#
    • 1...Sf1
      • 2.Bd5#
      • 2.Bf5#
    • 1...Sc2
      • 2.Bd5#
      • 2.Bf5#
    • 1...Sg2
      • 2.Bd5#
      • 2.Bf5#
    • 1...Sc4
      • 2.Bd5#
      • 2.Bf5#
    • 1...Sg4
      • 2.Bd5#
      • 2.Bf5#
    • 1...Sd5+
      • 2.Bxd5#
    • 1...Sf5+
      • 2.Bxf5#
    • 1...g5
      • 2.Sf6#
    • 1...g6
      • 2.Sf6#
  • Tries
    • 1.Qa8+?
      • 1...Sd5+
        • 2.Qxd5#
      • 1...Kxd4!
  • Keys
    • 1.Qe1!
      • threat
        • 2.Qxe3#
      • 1...Kxd4
        • 2.Rf4#
      • 1...Rxd4
        • 2.Bf5#
      • 1...Sxd4
        • 2.Bd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • S(a);N_GUARD::S(F)
    • S(a);N_GUARD::S(F),XS(a)
    • S(c);CHECK,N_GUARD::B(E),XS(c)
    • P(f);N_GUARD::S(F)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • S(c);CHECK,N_GUARD,P_SPINS(c)::QAB1(A),XS(c)
      • Refutation
        • K(e);P-FLIGHT,XB(C)
  • Actual
    • Q(A);P_PINS(c)
    • Threat
      • QAR1(A),XS(c)
    • Vars
      • K(e);N_SPINS(c),P-FLIGHT,XB(C)::R(B)
      • R(d);SBLOCK,XB(C)::B(E)
      • S(a);SBLOCK,XB(C)::B(E)
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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).