MESON Chess Problem Database

Problem Display
PID: 200344 (b7/3N4/nQp5/R4P2/2k4r/Pp1p3p/1b1P3K/8 w - - 0 1)

Heinonen, Unto

Suomen Shakki, 1973

b7/3N4/nQp5/R4P2/2k4r/Pp1p3p/1b1P3K/8

#2

7 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rd4
      • 2.Se5#
      • 2.Qxa6#
    • 1...Bc1
      • 2.Se5#
    • 1...Bxa3
      • 2.Se5#
    • 1...Bd4
      • 2.Qxa6#
    • 1...Be5+
      • 2.Sxe5#
    • 1...Sb4
      • 2.Qc5#
      • 2.Qxb4#
    • 1...Sc5
      • 2.Qxc5#
    • 1...Sc7
      • 2.Qc5#
      • 2.Qb4#
    • 1...Sb8
      • 2.Qc5#
      • 2.Qb4#
  • Tries
    • 1.Ra4+?
      • 1...Sb4
        • 2.Qc5#
      • 1...Kd5!
    • 1.Rc5+?
      • 1...Sxc5
        • 2.Qxc5#
      • 1...Kd4!
    • 1.Qg1?
      • threat
        • 2.Sb6#
      • 1...Be5+
        • 2.Sxe5#
      • 1...Bd4
        • 2.Qg8#
      • 1...Bxa3!
    • 1.Qf2?
      • threat
        • 2.Sb6#
      • 1...Be5+
        • 2.Sxe5#
      • 1...Bxa3
        • 2.Qxh4#
      • 1...Bd4!
    • 1.Qe3?
      • threat
        • 2.Sb6#
      • 1...Be5+
        • 2.Sxe5#
      • 1...Bd4
        • 2.Qe6#
      • 1...Bxa3!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Sb6#
      • 1...Be5+
        • 2.Sxe5#
      • 1...Kd4
        • 2.Qxh4#
      • 1...Bxa3
        • 2.Qxh4#
      • 1...Bd4
        • 2.Qg8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • B(a);N_GUARD::S(G)
    • B(a);N_GUARD,XP(C)::S(G)
    • B(a);SBLOCK::QAB(F),XS(g)
    • B(a);CHECK,N_GUARD::S(G),XB(a)
    • S(g);N_GUARD::QAR1(F),XS(g)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • S(g);P_SPINS(g)::QAR1(F)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • S(g);OGATE,XR(D)::QAR1(F),XS(g)
      • Refutation
        • K(e);P-FLIGHT
    • Try
      • Q(F);
      • Threat
        • S(G)
      • Vars
        • B(a);CHECK,N_GUARD::S(G),XB(a)
        • B(a);SBLOCK::QAB(F)
      • Refutation
        • B(a);XP(C)
    • Try
      • Q(F);
      • Threat
        • S(G)
      • Vars
        • B(a);CHECK,N_GUARD::S(G),XB(a)
        • B(a);N_GUARD,XP(C)::QAR(F),XR(f)
      • Refutation
        • B(a);
    • Try
      • Q(F);
      • Threat
        • S(G)
      • Vars
        • B(a);CHECK,N_GUARD::S(G),XB(a)
        • B(a);SBLOCK::QAB(F)
      • Refutation
        • B(a);XP(C)
  • Actual
    • Q(F);
    • Threat
      • S(G)
    • Vars
      • B(a);CHECK,N_GUARD::S(G),XB(a)
      • K(e);P-FLIGHT::QAR(F),XR(f)
      • B(a);N_GUARD,XP(C)::QAR(F),XR(f)
      • B(a);SBLOCK::QAB(F)
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