MESON Chess Problem Database

Problem Display
PID: 273295 (3nQ3/4q3/3p4/r2kNP2/2R3p1/3Npnp1/3RK2B/7B w - - 0 1)

van Gool, Johann Christoffel

Schakend Nederland, 1970

3nQ3/4q3/3p4/r2kNP2/2R3p1/3Npnp1/3RK2B/7B

#2

9 + 9

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Qh4
      • 2.Sb4#
      • 2.Sf4#
    • 1...Qg5
      • 2.Sb4#
      • 2.Sf4#
    • 1...Qf6
      • 2.Sb4#
      • 2.Sf4#
    • 1...Qf8
      • 2.Sb4#
      • 2.Sf4#
    • 1...Qa7
      • 2.Sb4#
      • 2.Sf4#
    • 1...Qb7
      • 2.Sb4#
      • 2.Sf4#
    • 1...Qc7
      • 2.Sb4#
      • 2.Sf4#
    • 1...Qd7
      • 2.Sb4#
      • 2.Sf4#
    • 1...Qf7
      • 2.Sb4#
      • 2.Sf4#
    • 1...Qg7
      • 2.Sb4#
      • 2.Sf4#
    • 1...Qh7
      • 2.Sb4#
      • 2.Sf4#
    • 1...Ra1
      • 2.Qb5#
    • 1...Ra2
      • 2.Qb5#
    • 1...Ra3
      • 2.Qb5#
    • 1...Ra4
      • 2.Qb5#
    • 1...Rb5
      • 2.Qxb5#
    • 1...Ra6
      • 2.Qb5#
    • 1...Ra7
      • 2.Qb5#
    • 1...Ra8
      • 2.Qb5#
    • 1...Sc6
      • 2.Qxc6#
    • 1...Se6
      • 2.Qc6#
    • 1...Sb7
      • 2.Qc6#
    • 1...Sf7
      • 2.Qc6#
    • 1...g2
      • 2.Sb4#
  • Tries
    • 1.Qxe7?
      • threat
        • 2.Sb4#
        • 2.Sf4#
      • 1...Se6
        • 2.Qxe6#
        • 2.Qb7#
      • 1...dxe5!
  • Keys
    • 1.Kxe3!
      • threat
        • 2.Rd4#
      • 1...Qg5+
        • 2.Sf4#
      • 1...Qxe5+
        • 2.Sxe5#
      • 1...Qa7+
        • 2.Sc5#
      • 1...dxe5
        • 2.Sb2#
      • 1...Ra4
        • 2.Qb5#
      • 1...Sc6
        • 2.Qxc6#
      • 1...Se6
        • 2.Qc6#
      • 1...g2
        • 2.Sb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 9
  • Sets
    • R(e);N_GUARD::QAR2(I)
    • R(e);N_GUARD,P_PINR(B)::QAR2(I)
    • R(e);N_GUARD::QAR2(I),XR(e)
    • S(i);N_GUARD::QAB1(I),XS(i)
    • S(i);N_GUARD::QAB1(I)
    • P(c);N_SPINS(b)::R(B)+S(E),DCHECK
  • Tries
    • Try
      • Q(I);XQ(h)
      • Threat
        • DUALS(2)
      • Refutation
        • P(g);XS(G)
  • Actual
    • K(C);P-FLIGHT,P_SPINS(G),XP(a)
    • Threat
      • R1(F)
    • Vars
      • Q(h);CHECK,N_PINS(G)::R(B)+S(E),DCHECK
      • Q(h);CHECK,XS(G)::R(B)+S(E),XQ(h)
      • Q(h);CHECK,N_PINS(G)::R(B)+S(E)
      • P(g);SBLOCK,XS(G)::R(B)+S(E)
      • R(e);N_GUARD::QAR2(I)
      • S(i);N_GUARD::QAB1(I),XS(i)
      • S(i);N_GUARD,N_PINS(G)::QAB1(I)
      • P(c);N_SPINS(b)::R(B)+S(E),DCHECK
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