MESON Chess Problem Database

Problem Display
PID: 23605 (4N3/4p3/4q3/2pPkbR1/1N2p2P/2P3P1/2PQnKB1/8 w - - 0 1)

Heathcote, Godfrey

Four-Leaved Shamrock (Coronation Ty.), 1911

4N3/4p3/4q3/2pPkbR1/1N2p2P/2P3P1/2PQnKB1/8

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd5
      • 2.Qxd5#
    • 1...Qf7
      • 2.Sc6#
    • 1...Qg8
      • 2.Sc6#
    • 1...Qc6
      • 2.Sxc6#
    • 1...Sc1
      • 2.Qf4#
    • 1...Sg1
      • 2.Qf4#
    • 1...Sxc3
      • 2.Qxc3#
    • 1...Sd4
      • 2.Qf4#
    • 1...Sf4
      • 2.Qxf4#
      • 2.gxf4#
    • 1...e3+
      • 2.Qxe3#
  • Tries
    • 1.Kxe2?
      • threat
        • 2.Qf4#
      • 1...Qxd5
        • 2.Qxd5#
      • 1...cxb4
        • 2.Qd4#
      • 1...e3
        • 2.Sd3#
        • 2.Qxe3#
      • 1...Qa6+!
    • 1.Sd3+?
      • 1...exd3
        • 2.Qe3#
      • 1...Kxd5!
    • 1.Rxf5+?
      • 1...Kxf5
        • 2.Qg5#
      • 1...Qxf5+!
    • 1.Qe3?
      • threat
        • 2.Qxe4#
      • 1...Sxc3
        • 2.Qxc3#
      • 1...Sxg3
        • 2.Qxg3#
      • 1...Qxd5!
    • 1.Qxe2?
      • threat
        • 2.Qxe4#
      • 1...e3+
        • 2.Qxe3#
      • 1...Qxd5!
  • Keys
    • 1.Qd3!
      • threat
        • 2.Qxe4#
      • 1...e3+
        • 2.Qxe3#
      • 1...Qxd5
        • 2.Qxd5#
      • 1...Sxc3
        • 2.Qxc3#
      • 1...Sxg3
        • 2.Qxg3#
      • 1...exd3
        • 2.Sxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(f);OGATE,XP(I)::QAR1(B),XQ(f)
    • Q(f);N_GUARD::S(G)
    • Q(f);N_GUARD::S(G),XQ(f)
    • S(a);N_GUARD::QAB1(B)
    • S(a);OGATE,XP(E)::QAB(B),XS(a)
    • P(b);CHECK,OGATEB::QAR2(B),XP(b)
  • Tries
    • Try
      • K(C);P-FLIGHT,XS(a)
      • Threat
        • QAB1(B)
      • Vars
        • Q(f);OGATE,XP(I)::QAR1(B),XQ(f)
        • P(c);N_GUARD,XS(G)::QAB1(B)
      • Refutation
        • Q(f);CHECK
    • Try
      • S(G);CHECK
      • Vars
        • P(b);XS(G)::QAR2(B)
      • Refutation
        • K(d);P-FLIGHT,P_SPINP(b),XP(I)
    • Try
      • R(J);CHECK,XB(e)
      • Vars
        • K(d);P-FLIGHT,XR(J)::QAR1(B)
      • Refutation
        • Q(f);CHECK,XR(J)
    • Try
      • Q(B);P_PINP(b)
      • Threat
        • QAR1(B),XP(b)
      • Vars
        • S(a);OGATE,XP(E)::QAB(B),XS(a)
        • S(a);OGATE,XP(F)::QAB(B),XS(a)
      • Refutation
        • Q(f);XP(I)
    • Try
      • Q(B);P_PINP(b),XS(a)
      • Threat
        • QAR1(B),XP(b)
      • Vars
        • P(b);CHECK,OGATEB::QAR2(B),XP(b)
      • Refutation
        • Q(f);XP(I)
  • Actual
    • Q(B);
    • Threat
      • QAR1(B),XP(b)
    • Vars
      • P(b);CHECK,OGATEB::QAR2(B),XP(b)
      • Q(f);OGATE,XP(I)::QAR1(B),XQ(f)
      • S(a);OGATE,XP(E)::QAB(B),XS(a)
      • S(a);OGATE,XP(F)::QAB(B),XS(a)
      • P(b);XQ(B)::S(G),XP(b)
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