MESON Chess Problem Database

Problem Display
PID: 60728 (1b3r2/2P5/Bpk1qN2/1N6/1Pp1r3/8/3QP3/3K4 w - - 0 1)

McIntyre, Donald Glenoe

Cape Times, 1956

1b3r2/2P5/Bpk1qN2/1N6/1Pp1r3/8/3QP3/3K4

#2

8 + 7

5639 Some Problems For My Friends 1957

SOLUTION

  • SOUND
  • Sets
    • 1...Qh3
      • 2.Qd5#
      • 2.Qd6#
    • 1...Qg4
      • 2.Qd5#
      • 2.Qd6#
    • 1...Qd5
      • 2.Qxd5#
    • 1...Qf5
      • 2.Qd6#
    • 1...Qd7
      • 2.Qxd7#
    • 1...Qf7
      • 2.Qd6#
    • 1...Qc8
      • 2.Qd5#
      • 2.Qd6#
    • 1...Qg8
      • 2.Qd6#
      • 2.Qd7#
    • 1...Qe5
      • 2.Qd7#
    • 1...Qd6
      • 2.Qxd6#
    • 1...Qe7
      • 2.Qd5#
    • 1...Qe8
      • 2.Qd5#
      • 2.Qd6#
    • 1...Rxf6
      • 2.cxb8S#
    • 1...Rf7
      • 2.cxb8S#
    • 1...Rd8
      • 2.cxd8S#
    • 1...Bxc7
      • 2.Sa7#
  • Tries
    • 1.c8Q+?
      • 1...Qxc8
        • 2.Qd5#
      • 1...Bc7
        • 2.Sa7#
        • 2.Qb7#
        • 2.Qxc7#
      • 1...Rxc8!
    • 1.c8R+?
      • 1...Qxc8
        • 2.Qd5#
      • 1...Bc7
        • 2.Sa7#
        • 2.Rxc7#
      • 1...Rxc8!
  • Keys
    • 1.Qd8!
      • threat
        • 2.cxb8S#
      • 1...Qd5+
        • 2.Qxd5#
      • 1...Qd7+
        • 2.Qxd7#
      • 1...Qd6+
        • 2.Qxd6#
      • 1...Rd4+
        • 2.Sxd4#
      • 1...Rxd8+
        • 2.cxd8S#
      • 1...Bxc7
        • 2.Sa7#
        • 2.Qxc7#
      • 1...Qc8
        • 2.Qd5#
        • 2.Qd6#
      • 1...Qe5
        • 2.Qd7#
      • 1...Ba7
        • 2.Sxa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(e);N_GUARD,P_PINQ(B)::QAB1(B),XQ(e)
    • Q(e);N_GUARD::QAR1(B)
    • Q(e);N_GUARD::QAB1(B)
    • Q(e);N_GUARD,P_PINQ(B)::QAR1(B),XQ(e)
    • R(g);N_GUARD,XS(G)::PXB(f)=S
    • R(g);N_GUARD::PXB(f)=S
    • R(g);OGATE,P_PINQ(B)::PXR(g)=S
    • B(f);N_GUARD,SBLOCK,XP(H)::S(E)
  • Tries
    • Try
      • P(H);CHECK
      • Vars
        • Q(e);XQ(H)::QAB1(B)
      • Refutation
        • R(g);XQ(H)
    • Try
      • P(H);CHECK
      • Vars
        • Q(e);XR(H)::QAB1(B)
      • Refutation
        • R(g);XR(H)
  • Actual
    • Q(B);
    • Threat
      • PXB(f)=S
    • Vars
      • Q(e);CHECK,N_GUARD::QAB1(B),XQ(e)
      • Q(e);CHECK,N_GUARD::QAR1(B),XQ(e)
      • R(b);CHECK,N_GUARD::S(E),XR(b)
      • R(g);CHECK,OGATE,XQ(B)::PXR(g)=S
      • Q(e);N_GUARD::QAB1(B)
      • B(f);N_GUARD::S(E),XB(f)
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