MESON Chess Problem Database

Problem Display
PID: 203718 (8/7B/7R/6bb/4R1r1/5QPk/5B1p/3K4 w - - 0 1)

Rosner, Eugene David

The Problemist, 1984

8/7B/7R/6bb/4R1r1/5QPk/5B1p/3K4

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg3
      • 2.Bf5#
    • 1...Rxe4
      • 2.g4#
    • 1...Rf4
      • 2.gxf4#
    • 1...Rh4
      • 2.g4#
    • 1...h1Q+
      • 2.Qxh1#
    • 1...h1S
      • 2.Qxh1#
    • 1...h1B
      • 2.Qxh1#
    • 1...h1R+
      • 2.Qxh1#
  • Tries
    • 1.Bf5?
      • threat
        • 2.Bxg4#
      • 1...h1Q+
        • 2.Qxh1#
      • 1...h1R+
        • 2.Qxh1#
      • 1...h1S
        • 2.Qxh1#
      • 1...h1B
        • 2.Qxh1#
      • 1...Bh4
        • 2.gxh4#
      • 1...Bxh6!
    • 1.Rxh5+?
      • 1...Rh4
        • 2.Bf5#
        • 2.gxh4#
        • 2.g4#
      • 1...Bh4!
  • Keys
    • 1.Be1!
      • threat
        • 2.Qf1#
      • 1...Rxg3
        • 2.Bf5#
      • 1...Rxe4
        • 2.g4#
      • 1...h1Q
        • 2.Qxh1#
      • 1...h1S
        • 2.Qxh1#
      • 1...h1B
        • 2.Qxh1#
      • 1...h1R
        • 2.Qxh1#
      • 1...Rf4
        • 2.gxf4#
      • 1...Rh4
        • 2.g4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • R(c);OGATEB,P_PINQ(C),P_SPINR(c),XP(D)::B(G)
    • R(c);OGATE,P_PINQ(C),XR(E)::QAR(C)+P(D)
    • R(c);OGATE,P_PINQ(C)::QAR(C)+P(D),XR(c)
    • R(c);N_SPINB(e),OGATE,P_PINQ(C)::QAR(C)+P(D)
    • P(a);CHECK,OGATEB::QAR2(C),XQ(a)
    • P(a);OGATEB::QAR2(C),XS(a)
    • P(a);OGATEB::QAR2(C),XB(a)
    • P(a);CHECK,OGATEB::QAR2(C),XR(a)
  • Tries
    • Try
      • B(G);P_PINR(c)
      • Threat
        • B(G),XR(c)
      • Vars
        • P(a);CHECK,OGATEB::QAR2(C),XQ(a)
        • P(a);CHECK,OGATEB::QAR2(C),XR(a)
        • P(a);OGATEB::QAR2(C),XS(a)
        • P(a);OGATEB::QAR2(C),XB(a)
        • B(d);N_SPINB(e),OGATE::QAR(C)+P(D),XB(d)
      • Refutation
        • B(d);N_SPINB(e),XR(F)
    • Try
      • R(F);CHECK,XB(e)
      • Refutation
        • B(d);P_SPINB(d)
  • Actual
    • B(B);
    • Threat
      • QAB(C)
    • Vars
      • R(c);OGATEB,P_PINQ(C),P_SPINR(c),XP(D)::B(G)
      • R(c);OGATE,P_PINQ(C),XR(E)::QAR(C)+P(D)
      • P(a);OGATEB,P_PINB(B)::QAR2(C),XQ(a)
      • P(a);OGATEB::QAR2(C),XS(a)
      • P(a);OGATEB::QAR2(C),XB(a)
      • P(a);OGATEB,P_PINB(B)::QAR2(C),XR(a)
      • R(c);OGATE,P_PINQ(C)::QAR(C)+P(D),XR(c)
      • R(c);N_SPINB(e),OGATE,P_PINQ(C)::QAR(C)+P(D)
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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).