MESON Chess Problem Database

Problem Display
PID: 2960 (8/4pN1b/2Q5/2p2k1K/2P4p/4p3/4N1P1/8 w - - 0 1)

Rothstein, Louis

Source?, 1914

8/4pN1b/2Q5/2p2k1K/2P4p/4p3/4N1P1/8

#2

6 + 6

2681 All Change Here! 1919
56 The Problemist 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bg6+
      • 2.Qxg6#
    • 1...Bg8
      • 2.Qg6#
    • 1...h3
      • 2.g4#
    • 1...e5
      • 2.Sh6#
    • 1...e6
      • 2.Qf3#
  • Tries
    • 1.Sg3+?
      • 1...Kf4
        • 2.Qf3#
      • 1...hxg3!
    • 1.Sd4+?
      • 1...Kf4
        • 2.Qf3#
      • 1...cxd4!
    • 1.Qd5+?
      • 1...e5
        • 2.Qxe5#
      • 1...Kf6!
    • 1.Qd6?
      • threat
        • 2.Qe5#
      • 1...Bg6+
        • 2.Qxg6#
      • 1...Ke4
        • 2.Qd5#
      • 1...e5
        • 2.Qxe5#
      • 1...exd6!
    • 1.g3?
      • threat
        • 2.g4#
      • 1...Bg6+
        • 2.Qxg6#
      • 1...e6
        • 2.Qf3#
      • 1...hxg3!
  • Keys
    • 1.Qh6!
      • 1...Bg6+
        • 2.Qxg6#
      • 1...Ke4
        • 2.Qxh7#
      • 1...Bg8
        • 2.Qg6#
      • 1...h3
        • 2.Sg3#
      • 1...e5
        • 2.Sd6#
      • 1...e6
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • B(f);CHECK,N_GUARD::QAB1(E),XB(f)
    • B(f);N_GUARD::QAB1(E)
    • P(b);N_GUARD::P(B)
    • P(e);SBLOCK::S(F)
    • P(e);SBLOCK::QAR2(E)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR1(E)
      • Refutation
        • P(b);XS(A)
    • Try
      • S(A);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR1(E)
      • Refutation
        • P(c);XS(A)
    • Try
      • Q(E);CHECK
      • Vars
        • P(e);P_SPINP(e)::QAR1(E),XP(e)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • B(f);CHECK,N_GUARD::QAB1(E),XB(f)
        • K(d);S_FLIGHT::QAB1(E)
        • P(e);::QAR1(E),XP(e)
      • Refutation
        • P(e);XQ(E)
    • Try
      • P(B);
      • Threat
        • P(B)
      • Vars
        • B(f);CHECK,N_GUARD::QAB1(E),XB(f)
        • P(e);SBLOCK::QAR2(E)
      • Refutation
        • P(b);XP(B)
  • Actual
    • Q(E);
    • Vars
      • B(f);CHECK,N_GUARD::QAB1(E),XB(f)
      • K(d);S_FLIGHT::QAB(E),XB(f)
      • B(f);N_GUARD::QAB1(E)
      • P(b);N_GUARD::S(A)
      • P(e);N_GUARD,SBLOCK::S(F)
      • P(e);SBLOCK::QAR1(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).