MESON Chess Problem Database

Problem Display
PID: 60708 (6R1/1B6/p7/3qB3/Qnp5/2pp4/p7/2RK3k w - - 0 1)

McIntyre, Donald Glenoe

Natal Mercury, 1920

6R1/1B6/p7/3qB3/Qnp5/2pp4/p7/2RK3k

#2

6 + 8

5639 Some Problems For My Friends 1957

SOLUTION

  • SOUND
  • Sets
    • 1...Qf3+
      • 2.Bxf3#
    • 1...Qe4
      • 2.Bxe4#
    • 1...Sc2
      • 2.Bxd5#
    • 1...c2+
      • 2.Kd2#
  • Tries
    • 1.Qd7?
      • threat
        • 2.Qh3#
        • 2.Qh7#
      • 1...Qf3+
        • 2.Bxf3#
      • 1...c2+
        • 2.Kd2#
      • 1...Qxb7
        • 2.Qh3#
      • 1...Qg2!
    • 1.Qe8?
      • threat
        • 2.Qh5#
      • 1...Qf3+
        • 2.Bxf3#
      • 1...c2+
        • 2.Kd2#
      • 1...Qg2!
    • 1.Qxa2?
      • threat
        • 2.Qh2#
      • 1...Qf3+
        • 2.Bxf3#
      • 1...c2+
        • 2.Kd2#
      • 1...Sxa2
        • 2.Bxd5#
      • 1...Qg2
        • 2.Qxg2#
      • 1...Sc2
        • 2.Bxd5#
      • 1...d2!
    • 1.Qxb4?
      • threat
        • 2.Bxd5#
      • 1...Qf3+
        • 2.Bxf3#
      • 1...c2+
        • 2.Kd2#
      • 1...Qxb7
        • 2.Qxb7#
      • 1...Qe4
        • 2.Bxe4#
      • 1...Qc6
        • 2.Bxc6#
      • 1...Qg2!
  • Keys
    • 1.Qc2!
      • threat
        • 2.Qh2#
      • 1...Qf3+
        • 2.Bxf3#
      • 1...dxc2+
        • 2.Ke2#
      • 1...Sxc2
        • 2.Bxd5#
      • 1...Qg2
        • 2.Qxg2#
      • 1...d2
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(g);CHECK,OGATE::B(E),XQ(g)
    • Q(g);OGATE::B(E),XQ(g)
    • S(e);N_GUARD::B(E),XQ(g)
    • P(c);CHECK::R(A)+K(B)
  • Tries
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • Q(g);CHECK,OGATE::B(E),XQ(g)
        • P(c);CHECK::R(A)+K(B)
        • Q(g);N_SPINQ(g),XB(E)::QAR2(C)
      • Refutation
        • Q(g);
    • Try
      • Q(C);
      • Threat
        • QAR(C)
      • Vars
        • Q(g);CHECK,OGATE::B(E),XQ(g)
        • P(c);CHECK::R(A)+K(B)
      • Refutation
        • Q(g);
    • Try
      • Q(C);XP(b)
      • Threat
        • QAR1(C)
      • Vars
        • Q(g);CHECK,OGATE::B(E),XQ(g)
        • P(c);CHECK::R(A)+K(B)
        • S(e);N_GUARD,SBLOCK,XQ(C)::B(E),XQ(g)
        • Q(g);N_GUARD::QAB1(C),XQ(g)
        • S(e);N_GUARD::B(E),XQ(g)
      • Refutation
        • P(d);
    • Try
      • Q(C);XS(e)
      • Threat
        • B(E),XQ(g)
      • Vars
        • Q(g);CHECK,OGATE::B(E),XQ(g)
        • P(c);CHECK::R(A)+K(B)
        • Q(g);N_SPINQ(g),OGATE,XB(E)::QAB(C),XQ(g)
        • Q(g);OGATE::B(E),XQ(g)
        • Q(g);OGATEB::B(E),XQ(g)
      • Refutation
        • Q(g);
  • Actual
    • Q(C);
    • Threat
      • QAR1(C)
    • Vars
      • Q(g);CHECK,OGATE::B(E),XQ(g)
      • P(d);CHECK,XQ(C)::R(A)+K(B)
      • S(e);N_GUARD,XQ(C)::B(E),XQ(g)
      • Q(g);N_GUARD::QAB1(C),XQ(g)
      • P(d);OGATE::QAR(C)
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