MESON Chess Problem Database

Problem Display
PID: 51516 (8/4p1Qn/5r1p/p2P4/Rr3k1p/1PP3RP/1KB4B/8 w - - 0 1)

Beal, Edward W

The Guardian, 1962

8/4p1Qn/5r1p/p2P4/Rr3k1p/1PP3RP/1KB4B/8

#2

10 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Rg5#
    • 1...hxg3
      • 2.Qxg3#
    • 1...e5
      • 2.Qg4#
  • Tries
    • 1.Rd3+?
      • 1...Kf5
        • 2.Rf3#
        • 2.Rd4#
      • 1...Ke4!
    • 1.Rxb4+?
      • 1...Ke5
        • 2.Rg5#
      • 1...axb4!
    • 1.Qxh6+?
      • 1...Ke5
        • 2.Rg5#
      • 1...Sg5
        • 2.Qxg5#
      • 1...Rxh6!
    • 1.Qg6?
      • threat
        • 2.Rd3#
      • 1...Ke5
        • 2.Rg5#
      • 1...hxg3
        • 2.Qxg3#
      • 1...Rf5
        • 2.Qxf5#
      • 1...Rxg6!
    • 1.cxb4?
      • threat
        • 2.Rc3#
      • 1...hxg3
        • 2.Qxg3#
      • 1...Rg6
        • 2.Qd4#
        • 2.bxa5#
        • 2.b5#
      • 1...Ke5!
  • Keys
    • 1.c4!
      • threat
        • 2.Rc3#
      • 1...Rxb3+
        • 2.Rxb3#
      • 1...Ke5
        • 2.Rg4#
      • 1...hxg3
        • 2.Qxg3#
      • 1...Rg6
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(b);N_SPINR(a),P_SPINR(e),S_FLIGHT::B(C)+R(F),DCHECK
    • P(c);OGATE,P_SPINP(c),XR(F)::QAB1(J),XP(c)
    • P(g);SBLOCK::QAR1(J)
  • Tries
    • Try
      • R(F);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • R(H);CHECK,N_SPINP(D),XR(a)
      • Vars
        • K(b);P_SPINR(e),S_FLIGHT::B(C)+R(F),DCHECK
      • Refutation
        • P(d);XR(H)
    • Try
      • Q(J);CHECK,XP(f)
      • Vars
        • K(b);N_SPINR(a),S_FLIGHT::B(C)+R(F),DCHECK
        • S(h);N_GUARD,P_SPINS(h)::QAB1(J),XS(h)
      • Refutation
        • R(e);XQ(J)
    • Try
      • Q(J);
      • Threat
        • B(C)+R(F)
      • Vars
        • K(b);N_SPINR(a),S_FLIGHT::B(C)+R(F),DCHECK
        • P(c);OGATE,P_SPINP(c),XR(F)::QAB1(J),XP(c)
        • R(e);N_GUARD::QAR1(J),XR(e)
      • Refutation
        • R(e);XQ(J)
    • Try
      • P(E);N_SPINP(D),XR(a)
      • Threat
        • B(C)+R(F)
      • Vars
        • P(c);OGATE,P_SPINP(c),XR(F)::QAB1(J),XP(c)
      • Refutation
        • K(b);P_SPINR(e),S_FLIGHT
  • Actual
    • P(E);N_PINR(a)
    • Threat
      • B(C)+R(F)
    • Vars
      • R(a);CHECK,OGATE,XP(D)::B(C)+R(F),XR(a)
      • K(b);P_SPINR(e),S_FLIGHT::B(C)+R(F)
      • P(c);OGATE,P_SPINP(c),XR(F)::QAB1(J),XP(c)
      • R(e);OGATE::QAR2(J)
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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).