MESON Chess Problem Database

Problem Display
PID: 196696 (8/K1N3B1/B2p1n2/4r3/b2k4/3N2Q1/1P6/8 w - - 0 1)

Janet, Frank

Good Companions, 1919

8/K1N3B1/B2p1n2/4r3/b2k4/3N2Q1/1P6/8

#2

7 + 5

5454 Near Snap 2019
6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Qf4#
    • 1...Ra5
      • 2.Qf4#
    • 1...Rc5
      • 2.Qf4#
    • 1...Rd5
      • 2.Qf4#
    • 1...Rg5
      • 2.Qf4#
    • 1...Rh5
      • 2.Qf4#
    • 1...Sg4
      • 2.Qf4#
    • 1...Sd7
      • 2.Qf4#
    • 1...Sh7
      • 2.Qf4#
    • 1...Se8
      • 2.Qf4#
    • 1...Sg8
      • 2.Qf4#
    • 1...d5
      • 2.Qxe5#
  • Tries
    • 1.Sf2?
      • threat
        • 2.Qc3#
      • 1...Kc5
        • 2.Qc3#
      • 1...Re3
        • 2.Qxd6#
      • 1...Rc5
        • 2.Qf4#
      • 1...Sd5
        • 2.Se6#
      • 1...Se4!
    • 1.Qf2+?
      • 1...Ke4
        • 2.Qf4#
      • 1...Re3!
    • 1.Qf4+?
      • 1...Re4
        • 2.Bxf6#
      • 1...Se4!
  • Keys
    • 1.Sc5!
      • threat
        • 2.Qc3#
      • 1...Kxc5
        • 2.Qc3#
      • 1...Rxc5
        • 2.Qf4#
      • 1...dxc5
        • 2.Qd3#
      • 1...Re3
        • 2.Qxd6#
      • 1...Se4
        • 2.S5e6#
      • 1...Sd5
        • 2.S7e6#

Anticipated by 21379(1918)

This anticipates 163789(1953), 135730(1961)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 11
  • Sets
    • K(b);P-FLIGHT::QAR1(C)
    • R(c);N_GUARD,P_PINB(D),P_SPINS(e)::QAR2(C)
    • R(c);N_GUARD,P_SPINS(e)::QAR2(C)
    • S(e);N_GUARD,P_SPINR(c)::QAR2(C)
    • P(d);N_GUARD::QAB1(C),XR(c)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAB1(C)
      • Vars
        • K(b);S_FLIGHT::QAR2(C)
        • R(c);OGATE,P_SPINS(e),SBLOCK::QAR2(C),XP(d)
        • R(c);N_GUARD,P_SPINS(e),SBLOCK::QAR2(C)
        • S(e);P_SPINR(c),SBLOCK::S(F)
      • Refutation
        • S(e);P_SPINR(c)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(C)
      • Refutation
        • R(c);P_SPINR(c),P_SPINS(e)
    • Try
      • Q(C);CHECK
      • Vars
        • R(c);P_SPINR(c),P_SPINS(e)::B(G),XS(e)
      • Refutation
        • S(e);P_SPINR(c),P_SPINS(e)
  • Actual
    • S(B);
    • Threat
      • QAB1(C)
    • Vars
      • K(b);S_FLIGHT,XS(B)::QAR2(C)
      • R(c);N_GUARD,P_SPINS(e),SBLOCK,XS(B)::QAR2(C)
      • P(d);SBLOCK,XS(B)::QAR1(C)
      • R(c);OGATE,P_SPINS(e),SBLOCK::QAR2(C),XP(d)
      • S(e);P_SPINR(c),SBLOCK::S(B)
      • S(e);P_SPINR(c),SBLOCK::S(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).