MESON Chess Problem Database

Problem Display
PID: 15266 (8/8/8/B5PB/Q1Knp1R1/8/1p1Pk1Np/1Rn4N w - - 0 1)

Heinonen, Unto

10th Place, 02. WCCT, 1980-1983

8/8/8/B5PB/Q1Knp1R1/8/1p1Pk1Np/1Rn4N

#2

10 + 6

117 Suomen Shakki 1983

SOLUTION

  • SOUND
  • Sets
    • 1...Kf1
      • 2.Qd1#
    • 1...Kf3
      • 2.Rg3#
    • 1...Sa2
      • 2.Rxe4#
      • 2.Qd1#
    • 1...Scb3
      • 2.Rxe4#
    • 1...Sd3
      • 2.Rxe4#
      • 2.Qd1#
    • 1...Sc2
      • 2.Rf4#
    • 1...Sdb3
      • 2.Rf4#
    • 1...Sb5
      • 2.Rf4#
    • 1...Sf5
      • 2.Rf4#
    • 1...Sc6
      • 2.Rf4#
    • 1...Se6
      • 2.Rf4#
  • Tries
    • 1.Kxd4?
      • threat
        • 2.Rf4#
      • 1...Kf1
        • 2.Qd1#
      • 1...Kf3
        • 2.Rg3#
      • 1...Sb3+!
    • 1.Sf4+?
      • 1...Kf1
        • 2.Qd1#
      • 1...Kf3
        • 2.Rh4#
      • 1...Ke1!
    • 1.Rg3+?
      • 1...Kf1
        • 2.Qd1#
      • 1...Sf3!
  • Keys
    • 1.Se3!
      • threat
        • 2.Qd1#
      • 1...Ke1
        • 2.Qd1#
      • 1...Kf3
        • 2.Rh4#
      • 1...Scb3
        • 2.Rg2#
      • 1...Sc2
        • 2.Rg1#
      • 1...Sdb3
        • 2.Rg1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • K(c);P_SPINS(a),S_FLIGHT::QAR2(E)
    • K(c);S_FLIGHT::B(J)+R(G),DCHECK
    • S(a);::B(J)+R(G),DCHECK,XP(f)
    • S(e);N_GUARD::B(J)+R(G)
  • Tries
    • Try
      • K(F);P-FLIGHT,XS(e)
      • Threat
        • B(J)+R(G)
      • Vars
        • K(c);P_SPINS(a),S_FLIGHT::QAR2(E)
        • K(c);S_FLIGHT::B(J)+R(G),DCHECK
      • Refutation
        • S(a);CHECK
    • Try
      • S(D);CHECK
      • Vars
        • K(c);P_SPINS(a),S_FLIGHT::QAR2(E)
        • K(c);S_FLIGHT::B(J)+R(G)
      • Refutation
        • K(c);P-FLIGHT,P_SPINS(a)
    • Try
      • R(G);CHECK
      • Vars
        • K(c);P_SPINS(a),S_FLIGHT::QAR2(E)
      • Refutation
        • S(e);P_SPINS(e)
  • Actual
    • S(D);
    • Threat
      • QAB1(E)
    • Vars
      • K(c);P-FLIGHT,P_SPINS(a)::QAR1(E)
      • K(c);S_FLIGHT::B(J)+R(G)
      • S(a);::B(J)+R(G),DCHECK
      • S(e);N_GUARD::B(J)+R(G)
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