MESON Chess Problem Database

Problem Display
PID: 12391 (8/7p/3n4/8/8/NRNk4/5Q2/Rn2K3 w Q - 0 1)

Macleod, Norman Alasdair

The Problemist, 1978

8/7p/3n4/8/8/NRNk4/5Q2/Rn2K3

#2

6 + 4

3750 FIDE Album (1977-1979) 1984
3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Qxd2#
  • Tries
    • 1.Sd1+?
      • 1...Sc3
        • 2.Qe3#
      • 1...Ke4!
    • 1.Se2+?
      • 1...Sc3
        • 2.Qd4#
        • 2.Qf3#
      • 1...Ke4!
    • 1.Sa4+?
      • 1...Sc3
        • 2.Sc5#
      • 1...Ke4!
    • 1.Se4+?
      • 1...Sc3
        • 2.Sc5#
      • 1...Kxe4!
    • 1.Scb5+?
      • 1...Sc3
        • 2.Qd4#
        • 2.Qe2#
        • 2.Qf3#
      • 1...Ke4!
    • 1.Sd5+?
      • 1...Sc3
        • 2.Qe3#
      • 1...Ke4!
    • 1.Qf1+?
      • 1...Ke3
        • 2.Sc2#
      • 1...Kd4!
    • 1.Qf5+?
      • 1...Ke3
        • 2.Sc2#
      • 1...Kd4
        • 2.Se2#
      • 1...Se4
        • 2.Qxe4#
      • 1...Sxf5!
  • Keys
    • 1.Qf4!
      • threat
        • 2.Scxb1#
      • 1...Sxa3
        • 2.0-0-0#
      • 1...Sxc3
        • 2.Rd1#
      • 1...Se4
        • 2.Qxe4#
      • 1...Sd2
        • 2.Qxd2#
      • 1...Sb5
        • 2.Qe4#

This is a version

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR1(C),XS(a)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • S(a);P_SPINS(a)::QAR1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(F);CHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • S(a);P_SPINS(a)::S(F)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • S(a);P_SPINS(a)::S(F)
      • Refutation
        • K(b);S_FLIGHT,XS(F)
    • Try
      • S(F);CHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • S(a);P_SPINS(a)::QAR1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT::S(D)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT::S(D)
        • K(b);P-FLIGHT::S(F)
        • S(c);N_GUARD,P_SPINS(c)::QAB1(C),XS(c)
      • Refutation
        • S(c);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • R(E)+S(F),XS(a)
    • Vars
      • S(a);XS(D)::0-0-0
      • S(a);OGATE,P_SPINS(a),XS(F)::R(A)
      • S(c);N_GUARD::QAB1(C),XS(c)
      • S(a);N_GUARD::QAR1(C),XS(a)
      • S(c);N_GUARD::QAB1(C)
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