MESON Chess Problem Database

Problem Display
PID: 276505 (3R4/8/4p3/3q4/K3N1Qp/1P1k4/pRN5/r2r1bnB w - - 0 1)

Macleod, Norman Alasdair

Mat, 1981

3R4/8/4p3/3q4/K3N1Qp/1P1k4/pRN5/r2r1bnB

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4+
      • 2.Rxd4#
    • 1...Qd6
      • 2.Rxd6#
    • 1...Qd7+
      • 2.Rxd7#
    • 1...Se2
      • 2.Qf3#
    • 1...Sf3
      • 2.Qxf3#
    • 1...Sh3
      • 2.Qf3#
    • 1...e5
      • 2.Rxd5#
  • Tries
    • 1.Qxg1?
      • threat
        • 2.Sb4#
        • 2.Qe3#
      • 1...Qd4+
        • 2.Sb4#
      • 1...Ke2
        • 2.Qe3#
      • 1...Bg2
        • 2.Qe3#
      • 1...Re1
        • 2.Sb4#
      • 1...Rd2
        • 2.Qe3#
      • 1...Qd7+!
    • 1.Qg3+?
      • 1...Ke2
        • 2.Sd4#
        • 2.Qe3#
      • 1...Sf3
        • 2.Qxf3#
      • 1...hxg3!
    • 1.Qf4?
      • threat
        • 2.Qe3#
      • 1...Qd4+
        • 2.Sb4#
      • 1...Ke2
        • 2.Qe3#
      • 1...Re1
        • 2.Qd2#
      • 1...Qd7+!
  • Keys
    • 1.Qg5!
      • threat
        • 2.Qe3#
      • 1...Qd4+
        • 2.Sb4#
      • 1...Qd7+
        • 2.Qb5#
      • 1...Ke2
        • 2.Qe3#
      • 1...Re1
        • 2.Qd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • Q(h);CHECK,OGATE::R1(H),XQ(h)
    • Q(h);OGATEB::R(H),XQ(h)
    • Q(h);CHECK,OGATEB::R(H),XQ(h)
    • S(d);N_GUARD::QAR2(G)
    • S(d);N_GUARD::QAR2(G),XS(d)
    • P(i);N_GUARD::R(H),XQ(h)
  • Tries
    • Try
      • Q(G);XS(d)
      • Threat
        • DUALS(2)
      • Vars
        • Q(h);CHECK::S(C)
        • K(f);N_SPINQ(h),S_FLIGHT::QAR1(G)
        • B(c);::QAR1(G)
        • R(b);::S(C)
        • R(b);::QAR1(G)
      • Refutation
        • Q(h);CHECK
    • Try
      • Q(G);CHECK
      • Vars
        • S(d);N_GUARD,P_SPINS(d)::QAR2(G),XS(d)
      • Refutation
        • P(g);XQ(G)
    • Try
      • Q(G);
      • Threat
        • QAR1(G)
      • Vars
        • Q(h);CHECK::S(C)
        • K(f);N_SPINQ(h),S_FLIGHT::QAR1(G)
        • R(b);N_GUARD::QAR1(G)
      • Refutation
        • Q(h);CHECK
  • Actual
    • Q(G);
    • Threat
      • QAR1(G)
    • Vars
      • Q(h);CHECK::S(C)
      • Q(h);CHECK,OGATE::QAB(G)
      • K(f);N_SPINQ(h),S_FLIGHT::QAR1(G)
      • R(b);N_GUARD::QAR1(G)
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