MESON Chess Problem Database

Problem Display
PID: 376 (2Bb4/1K2P1rN/R1Pk1nbR/5p2/3P3B/5Q2/1Np5/8 w - - 0 1)

Kish, Alexander

The Observer, 1937

(First published on Sun Mar 14 1937)

2Bb4/1K2P1rN/R1Pk1nbR/5p2/3P3B/5Q2/1Np5/8

#2

11 + 7

5088 How to Solve Chess Problems 1945
5066 Classic Chess Problems by Pioneer Composers 1970
5454 Near Snap 2007
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe7+
      • 2.c7#
    • 1...Bf7
      • 2.exd8Q#
    • 1...Bxe7
      • 2.Sc4#
      • 2.c7#
    • 1...Sg4
      • 2.Sc4#
      • 2.c7#
    • 1...Sd5
      • 2.Sc4#
    • 1...Sh5
      • 2.Sc4#
      • 2.c7#
    • 1...Sxh7
      • 2.Sc4#
      • 2.c7#
    • 1...Se8
      • 2.Sc4#
      • 2.c7#
    • 1...Sg8
      • 2.Sc4#
      • 2.c7#
  • Tries
    • 1.Sxf6?
      • threat
        • 2.Se8#
        • 2.Qa3#
      • 1...Rxe7+
        • 2.c7#
      • 1...c1Q
        • 2.Se8#
      • 1...c1R
        • 2.Se8#
      • 1...Rg8
        • 2.Qa3#
      • 1...Be8
        • 2.Sxe8#
        • 2.Qa3#
      • 1...Ba5
        • 2.Se8#
      • 1...Bb6
        • 2.Se8#
      • 1...Kxe7!
    • 1.Qd5+?
      • 1...Kxe7
        • 2.Qe6#
        • 2.Qd7#
      • 1...Sxd5
        • 2.Sc4#
      • 1...Kxd5!
    • 1.Qf4+?
      • 1...Kd5
        • 2.Sxf6#
        • 2.Qe5#
      • 1...Kxe7!
    • 1.Qxf5?
      • threat
        • 2.Qe6#
        • 2.Qc5#
        • 2.Qe5#
      • 1...Rxe7+
        • 2.c7#
      • 1...Kxe7
        • 2.Qe6#
        • 2.Qd7#
      • 1...c1Q
        • 2.Qe6#
        • 2.Qe5#
      • 1...c1R
        • 2.Qe6#
        • 2.Qe5#
      • 1...Bf7
        • 2.Qd7#
        • 2.Qc5#
        • 2.Qe5#
        • 2.exd8Q#
      • 1...Bb6
        • 2.Qe6#
        • 2.Qe5#
      • 1...Se4
        • 2.Sc4#
        • 2.Qe6#
        • 2.Qd7#
        • 2.Qe5#
        • 2.c7#
      • 1...Sg4
        • 2.Sc4#
        • 2.Qe6#
        • 2.Qd7#
        • 2.Qc5#
        • 2.c7#
      • 1...Sd5
        • 2.Sc4#
        • 2.Qe6#
        • 2.Qd7#
        • 2.Qe5#
      • 1...Sd7
        • 2.Sc4#
        • 2.Qxd7#
        • 2.e8S#
      • 1...Bxf5!
  • Keys
    • 1.Qb3!
      • threat
        • 2.Qe6#
      • 1...Rxe7+
        • 2.c7#
      • 1...Kxe7
        • 2.Qe6#
      • 1...Bf7
        • 2.exd8Q#
      • 1...Sd5
        • 2.Sc4#
      • 1...Sd7
        • 2.e8S#

Anticipated by 50911(1923)

This anticipates 185747(1957)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(f);CHECK,SBLOCK,XP(I)::R(E)+P(F)
    • B(e);N_PINP(I),P_SPINS(d)::PXB(g)=Q
    • S(d);P_SPINB(e)::S(A)
  • Tries
    • Try
      • S(J);XS(d)
      • Threat
        • DUALS(2)
      • Vars
        • R(f);CHECK,SBLOCK,XP(I)::R(E)+P(F)
        • P(a);::S(J)
        • R(f);N_PINP(I)::QAB(B)
        • B(g);::S(J)
      • Refutation
        • K(c);S_FLIGHT,XP(I)
    • Try
      • Q(B);CHECK
      • Vars
        • S(d);P_SPINB(e),SBLOCK,XQ(B)::S(A)
      • Refutation
        • K(c);P-FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Refutation
        • K(c);P_SPINS(d),S_FLIGHT,XP(I)
    • Try
      • Q(B);XP(b)
      • Threat
        • DUALS(3)
      • Vars
        • R(f);CHECK,SBLOCK,XP(I)::R(E)+P(F)
      • Refutation
        • B(e);P_SPINS(d),XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • R(f);CHECK,SBLOCK,XP(I)::R(E)+P(F)
      • K(c);P_SPINS(d),S_FLIGHT,XP(I)::QAR1(B)
      • B(e);N_PINP(I),P_SPINS(d)::PXB(g)=Q
      • S(d);P_SPINB(e),SBLOCK::S(A)
      • S(d);N_PINP(I),P_SPINB(e)::P=S
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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).