MESON Chess Problem Database

Problem Display
PID: 97386 (bK2R3/2pk1p1p/1p3P2/4Q2r/2N1p1N1/6qB/3B4/3R2b1 w - - 0 1)

Andrade, Barry Jack da Costa

The Problemist, 1936

bK2R3/2pk1p1p/1p3P2/4Q2r/2N1p1N1/6qB/3B4/3R2b1

#2

9 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bc6
      • 2.Qe7#
    • 1...c6
      • 2.Be3#
  • Tries
    • 1.Re7+?
      • 1...Kc6
        • 2.Rxc7#
      • 1...Kd8!
    • 1.Rd8+?
      • 1...Kxd8
        • 2.Qe7#
      • 1...Kc6!
  • Keys
    • 1.Rc8!
      • threat
        • 2.Qe8#
      • 1...Kc6
        • 2.Rxc7#
      • 1...Qxe5
        • 2.Sgxe5#
      • 1...Rxe5
        • 2.Sgxe5#
      • 1...c5
        • 2.Sxb6#
      • 1...c6
        • 2.Be3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • B(j);SBLOCK::QAR1(F)
    • P(f);P_PINQ(F),SBLOCK,S_CUTB(j)::R(A)+B(B)
  • Tries
    • Try
      • R(I);CHECK
      • Vars
        • K(g);OGATE,S_FLIGHT::R1(I),XP(f)
      • Refutation
        • K(g);P-FLIGHT
    • Try
      • R(I);CHECK
      • Vars
        • K(g);P-FLIGHT,XR(I)::QAB1(F)
      • Refutation
        • K(g);S_FLIGHT
  • Actual
    • R(I);
    • Threat
      • QAB1(F)
    • Vars
      • K(g);P_SPINP(f),S_FLIGHT::R1(I),XP(f)
      • Q(b);XQ(F)::B(C)+S(E),DCHECK,XQ(b)
      • R(d);XQ(F)::B(C)+S(E),DCHECK,XR(d)
      • P(f);N_GUARD,P_PINQ(F),S_CUTB(a)::S(D),XP(e)
      • P(f);P_PINQ(F),S_CUTB(j)::R(A)+B(B)
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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).