MESON Chess Problem Database

Problem Display
PID: 12058 (8/B7/3p4/2qR1N2/6Qp/p7/K2pBk2/4b3 w - - 0 1)

Heinonen, Erkki

3rd Comm., KeyStip 12. Ty., 1974

8/B7/3p4/2qR1N2/6Qp/p7/K2pBk2/4b3

#2

6 + 7

3242 BCPS Rapid Solving (Cheltenham) 2001

SOLUTION

  • SOUND
  • Sets
    • 1...Qe3
      • 2.Bxe3#
    • 1...Qd4
      • 2.Bxd4#
    • 1...Qb6
      • 2.Bxb6#
  • Tries
    • 1.Bf3?
      • threat
        • 2.Qg2#
      • 1...Kf1
        • 2.Qg2#
      • 1...h3!
    • 1.Rd4?
      • threat
        • 2.Rf4#
      • 1...Qc4+
        • 2.Rxc4#
      • 1...Qd5+
        • 2.Rxd5#
      • 1...Qxd4
        • 2.Bxd4#
      • 1...Qc2+!
  • Keys
    • 1.Se3!
      • threat
        • 2.Sd1#
      • 1...Qc2+
        • 2.Sxc2#
      • 1...Qc4+
        • 2.Sxc4#
      • 1...Qxd5+
        • 2.Sxd5#
      • 1...Kxe3
        • 2.Qf3#
      • 1...Qxe3
        • 2.Rf5#
      • 1...d1Q
        • 2.Sxd1#
      • 1...d1S
        • 2.Sxd1#
      • 1...d1B
        • 2.Sxd1#
      • 1...d1R
        • 2.Sxd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 8
    • REMOVED MATES = 2
  • Sets
    • Q(f);OGATE::B(F),XQ(f)
    • Q(f);OGATEB::B(F),XQ(f)
  • Tries
    • Try
      • B(B);
      • Threat
        • QAR1(C)
      • Vars
        • K(c);N_SPINQ(f),P-FLIGHT::QAB1(C)
      • Refutation
        • P(e);
    • Try
      • R(D);N_PINQ(f)
      • Threat
        • R(D)
      • Vars
        • Q(f);CHECK,OGATEB::B(F)+R(D),XQ(f)
        • Q(f);OGATE,P_SPINQ(f),XR(D)::B(F),XQ(f)
      • Refutation
        • Q(f);CHECK
  • Actual
    • S(E);N_PINQ(f)
    • Threat
      • S(E)
    • Vars
      • Q(f);CHECK::B(F)+S(E),XQ(f)
      • Q(f);CHECK,XR(D)::B(F)+S(E),XQ(f)
      • K(c);P_SPINQ(f),S_FLIGHT,XS(E)::QAR1(C)
      • Q(f);N_GUARD,P_SPINQ(f),XS(E)::R(D)
      • P(b);::S(E),XQ(b)
      • P(b);::S(E),XS(b)
      • P(b);::S(E),XB(b)
      • P(b);::S(E),XR(b)
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