MESON Chess Problem Database

Problem Display
PID: 11529 (8/7Q/8/B1R3P1/3p1N2/4p3/pr1Pp3/1q2k1K1 w - - 0 1)

Spencer, George Burt

Chess, 1939

8/7Q/8/B1R3P1/3p1N2/4p3/pr1Pp3/1q2k1K1

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3
      • 2.Rc1#
    • 1...Qe4
      • 2.Rc1#
    • 1...Qf5
      • 2.Rc1#
    • 1...Qg6
      • 2.Rc1#
    • 1...Qxh7
      • 2.Rc1#
    • 1...Qc1
      • 2.Rxc1#
    • 1...Qd1
      • 2.Sg2#
      • 2.Sd3#
      • 2.Qh4#
  • Tries
    • 1.Sd3+?
      • 1...Qxd3
        • 2.Rc1#
      • 1...Kd1!
    • 1.Qh2?
      • threat
        • 2.Qxe2#
      • 1...Kd1
        • 2.Qxe2#
      • 1...Qd3
        • 2.Rc1#
      • 1...Qd1
        • 2.Sg2#
        • 2.Sd3#
        • 2.Qg3#
        • 2.Qh4#
      • 1...d3!
    • 1.Qh5?
      • threat
        • 2.Qxe2#
      • 1...Kd1
        • 2.Qxe2#
      • 1...Qd3
        • 2.Rc1#
      • 1...Qd1
        • 2.Sg2#
        • 2.Sd3#
        • 2.Qh4#
      • 1...d3!
  • Keys
    • 1.Qd3!
      • threat
        • 2.Qxe2#
      • 1...Kd1
        • 2.Qxe2#
      • 1...Qxd3
        • 2.Rc1#
      • 1...Qd1
        • 2.Sg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • Q(a);N_GUARD::R(E)
    • Q(a);N_GUARD,P_PINP(F)::R(E)
    • Q(a);N_GUARD,XQ(G)::R(E)
    • Q(a);N_GUARD::R(E),XQ(a)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • Q(a);XS(C)::R(E)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(G);
      • Threat
        • QAR1(G),XP(e)
      • Vars
        • K(b);P-FLIGHT::QAB1(G),XP(e)
        • Q(a);N_GUARD::R(E)
      • Refutation
        • P(g);
    • Try
      • Q(G);
      • Threat
        • QAR1(G),XP(e)
      • Vars
        • K(b);P-FLIGHT,P_SPINP(e)::QAB1(G),XP(e)
        • Q(a);N_GUARD::R(E)
      • Refutation
        • P(g);
  • Actual
    • Q(G);
    • Threat
      • QAR1(G),XP(e)
    • Vars
      • K(b);P-FLIGHT::QAB1(G),XP(e)
      • Q(a);N_GUARD,XQ(G)::R(E)
      • Q(a);SBLOCK::S(C)
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