MESON Chess Problem Database

Problem Display
PID: 60707 (b1Q2Rnn/K1p2rRN/4N3/p1r2k2/q1p5/1pBPb2P/8/1B6 w - - 0 1)

McIntyre, Donald Glenoe

Natal Mercury, 1920

b1Q2Rnn/K1p2rRN/4N3/p1r2k2/q1p5/1pBPb2P/8/1B6

#2

10 + 12

5639 Some Problems For My Friends 1920

SOLUTION

  • SOUND
  • Sets
    • 1...Rd5+
      • 2.d4#
    • 1...Rc6+
      • 2.d4#
    • 1...Bg1
      • 2.Rg5#
    • 1...Bf2
      • 2.Rg5#
    • 1...Bd4
      • 2.Rg5#
    • 1...Bg5
      • 2.Rxg5#
    • 1...Be4
      • 2.dxe4#
  • Tries
    • 1.Sf4+?
      • 1...Kxf4
        • 2.Qg4#
      • 1...Qd7!
    • 1.Sxc5+?
      • 1...Kf4
        • 2.Qg4#
      • 1...Qd7!
    • 1.Seg5+?
      • 1...Kf4
        • 2.Qg4#
      • 1...Qd7!
    • 1.Sxc7+?
      • 1...Kf4
        • 2.Qg4#
      • 1...Qd7!
    • 1.Sd8+?
      • 1...Kf4
        • 2.Qg4#
      • 1...Qd7!
    • 1.Rfxf7+?
      • 1...Sf6
        • 2.Rxf6#
      • 1...Sxf7!
  • Keys
    • 1.Rg4!
      • threat
        • 2.Sg7#
      • 1...Rb5+
        • 2.Sc5#
      • 1...Rd5+
        • 2.d4#
      • 1...Re5+
        • 2.Sd4#
      • 1...Rc6+
        • 2.d4#
      • 1...c6+
        • 2.Sc7#
      • 1...Bd4
        • 2.Rg5#
      • 1...Bg5
        • 2.Rxg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • R(f);CHECK,S_CUTB(j)::B(A)+P(C)
    • B(b);N_GUARD::R1(G)
    • B(b);N_GUARD::R1(G),XB(b)
    • B(j);OGATE::P(C),XB(j)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(g);OGATE,P-FLIGHT,XS(E)::QAR1(I)
      • Refutation
        • Q(c);P_SPINQ(c)
    • Try
      • S(E);CHECK,P_SPINS(E),XR(f)
      • Vars
        • K(g);OGATE,P-FLIGHT::QAR1(I)
      • Refutation
        • Q(c);P_SPINQ(c)
    • Try
      • S(E);CHECK
      • Vars
        • K(g);OGATE,P-FLIGHT::QAR1(I)
      • Refutation
        • Q(c);P_SPINQ(c)
    • Try
      • S(E);CHECK,P_SPINS(E),XP(h)
      • Vars
        • K(g);OGATE,P-FLIGHT::QAR1(I)
      • Refutation
        • Q(c);P_SPINQ(c)
    • Try
      • S(E);CHECK
      • Vars
        • K(g);OGATE,P-FLIGHT::QAR1(I)
      • Refutation
        • Q(c);P_SPINQ(c)
    • Try
      • R(J);CHECK,XR(i)
      • Vars
        • S(k);N_GUARD,P_SPINS(k)::R1(J),XS(k)
      • Refutation
        • S(l);XR(J)
  • Actual
    • R(G);
    • Threat
      • QAB(I)+S(E),DCHECK
    • Vars
      • R(f);CHECK,S_CUTQ(c)::QAB(I)+S(E)
      • R(f);CHECK,S_CUTB(j)::B(A)+P(C)
      • R(f);CHECK,SBLOCK::QAB(I)+S(E),DCHECK
      • P(h);CHECK,S_CUTQ(c)::QAB(I)+S(E)
      • B(b);N_GUARD::R1(G)
      • B(b);N_GUARD::R1(G),XB(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).