MESON Chess Problem Database

Problem Display
PID: 21936 (8/1n6/NK6/8/kB6/rrPp4/3N4/3Q4 w - - 0 1)

Mendes de Moraes Filho, Feliciano

2nd Prize, Good Companions (April Complete Blocks), 1922

8/1n6/NK6/8/kB6/rrPp4/3N4/3Q4

#2

6 + 5

3132 The Good Companion Two-Mover 1922
3310 2345 Chess Problems 1997
5454 Near Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qxb3#
    • 1...Ra2
      • 2.Qxb3#
    • 1...Sa5
      • 2.Sc5#
    • 1...Sc5
      • 2.Sxc5#
    • 1...Sd6
      • 2.Sc5#
    • 1...Sd8
      • 2.Sc5#
  • Tries
    • 1.Sxb3?
      • threat
        • 2.Sbc5#
      • 1...Sc5
        • 2.Sbxc5#
        • 2.Saxc5#
      • 1...Rxb3!
    • 1.Qc2?
      • 1...Ra1
        • 2.Qxb3#
      • 1...Ra2
        • 2.Qxb3#
      • 1...Sa5
        • 2.Sc5#
      • 1...Sc5
        • 2.Sxc5#
      • 1...Sd6
        • 2.Sc5#
      • 1...Sd8
        • 2.Sc5#
      • 1...dxc2!
    • 1.Qh5?
      • threat
        • 2.Qe8#
        • 2.Qb5#
      • 1...Rxc3
        • 2.Qb5#
      • 1...Sa5
        • 2.Sc5#
        • 2.Qxa5#
        • 2.Qb5#
      • 1...Sc5
        • 2.Sxc5#
      • 1...Sd6
        • 2.Sc5#
        • 2.Qa5#
      • 1...Sd8
        • 2.Sc5#
        • 2.Qa5#
        • 2.Qb5#
      • 1...Rxb4+!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Qd7#
      • 1...Rxb4+
        • 2.Qxb4#
      • 1...Rxc3
        • 2.Bxc3#
      • 1...Sa5
        • 2.Sc5#
      • 1...Sc5
        • 2.Sxc5#
      • 1...Sd6
        • 2.Sc5#
      • 1...Sd8
        • 2.Sc5#

This anticipates 197832(2001)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(a);N_GUARD::QAB1(A),XR(b)
    • S(e);N_GUARD::S(E)
    • S(e);N_GUARD::S(E),XS(e)
  • Tries
    • Try
      • S(B);N_SPINB(D),XR(b)
      • Threat
        • QAB(A)+S(B),DCHECK
      • Refutation
        • R(a);P_PINB(D),P_SPINR(a),XS(B)
    • Try
      • Q(A);
      • Vars
        • R(a);N_GUARD::QAB1(A),XR(b)
        • S(e);N_GUARD::S(E)
        • S(e);N_GUARD::S(E),XS(e)
      • Refutation
        • P(c);N_SPINR(b),XQ(A)
    • Try
      • Q(A);N_PINR(b)
      • Threat
        • DUALS(2)
      • Vars
        • R(b);N_PINB(D),XP(C)::QAB1(A)
        • S(e);N_GUARD::S(E),XS(e)
      • Refutation
        • R(b);CHECK,XB(D)
  • Actual
    • Q(A);N_PINR(b)
    • Threat
      • QAB(A)
    • Vars
      • R(b);CHECK,OGATE,P_SPINR(b),XB(D)::QAR1(A),XR(b)
      • R(b);N_PINB(D),XP(C)::QAR(A)+B(D),XR(b)
      • S(e);N_GUARD::S(E)
      • S(e);N_GUARD::S(E),XS(e)
HTML5 logo

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).