MESON Chess Problem Database

Problem Display
PID: 252809 (3Qb3/3npp2/N1P1rp2/3kpK2/RpN5/8/1P4nB/2R4B w - - 0 1)

Hoek, Willem

Schakend Nederland, 1978

3Qb3/3npp2/N1P1rp2/3kpK2/RpN5/8/1P4nB/2R4B

#2

10 + 10

15601 Albrecht-Leiss-Degener Collection 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Se3+?
      • 1...Kd6
        • 2.Qc7#
      • 1...Kd4!
    • 1.Sa5?
      • threat
        • 2.Rd1#
      • 1...Kd6
        • 2.Rd1#
      • 1...Kd4!
    • 1.Sb6+?
      • 1...Kd6
        • 2.Qc7#
      • 1...Kd4!
    • 1.Bg1?
      • threat
        • 2.Sxb4#
      • 1...b3
        • 2.Sb4#
      • 1...Kxc6!
    • 1.Rd1+?
      • 1...Kxc4
        • 2.Rxb4#
      • 1...Kxc6!
    • 1.Ra5+?
      • 1...Kxc6
        • 2.Qc7#
        • 2.Qa8#
        • 2.Qc8#
      • 1...Kd4!
    • 1.Qb6?
      • threat
        • 2.Sxb4#
        • 2.Sc7#
      • 1...Rxc6
        • 2.Sxb4#
      • 1...Sc5
        • 2.Qxc5#
      • 1...b3
        • 2.Sb4#
        • 2.Sc7#
        • 2.Rd1#
      • 1...Sxb6!
  • Keys
    • 1.Rxb4!
      • 1...Kd4
        • 2.Rd1#
      • 1...Kxc6
        • 2.Qa8#
      • 1...Rxc6
        • 2.Rd1#
      • 1...Rd6
        • 2.Se3#
      • 1...e4
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(c);N_GUARD,N_SPINS(a),P-FLIGHT,P_SPINP(d),P_SPINS(g)::QAB1(J)
      • Refutation
        • K(c);N_SPINS(a),P-FLIGHT,P_SPINP(b),P_SPINS(g)
    • Try
      • S(F);
      • Threat
        • R(A)
      • Vars
        • K(c);N_SPINS(a),P-FLIGHT,P_SPINP(d),P_SPINS(g)::R(A)
      • Refutation
        • K(c);N_SPINS(a),P-FLIGHT,P_SPINP(b),P_SPINS(g)
    • Try
      • S(F);CHECK
      • Vars
        • K(c);N_GUARD,N_SPINS(a),P-FLIGHT,P_SPINP(d),P_SPINS(g)::QAB1(J)
      • Refutation
        • K(c);N_SPINS(a),P-FLIGHT,P_SPINP(b),P_SPINS(g)
    • Try
      • B(D);
      • Threat
        • S(H),XP(b)
      • Vars
        • P(b);::S(H)
      • Refutation
        • K(c);S_FLIGHT,XP(I)
    • Try
      • R(A);CHECK
      • Vars
        • K(c);N_GUARD,N_SPINS(a),P_SPINP(b),S_FLIGHT,XS(F)::R1(E),XP(b)
      • Refutation
        • K(c);S_FLIGHT,XP(I)
    • Try
      • R(E);CHECK
      • Refutation
        • K(c);N_SPINS(a),P-FLIGHT,P_SPINS(g)
    • Try
      • Q(J);
      • Threat
        • DUALS(2)
      • Vars
        • R(e);XP(I)::S(H),XP(b)
        • S(g);N_GUARD::QAR1(J),XS(g)
      • Refutation
        • S(g);XQ(J)
  • Actual
    • R(E);XP(b)
    • Vars
      • K(c);N_GUARD,N_SPINS(a),P-FLIGHT,P_SPINS(g)::R(A)
      • K(c);OGATEB,S_FLIGHT,XP(I)::QAB(J)
      • R(e);SBLOCK,XP(I)::R(A)
      • R(e);SBLOCK::S(F)
      • P(d);N_SPINS(a),P_SPINS(g)::S(F)
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