MESON Chess Problem Database

Problem Display
PID: 248936 (4BB2/q7/2N5/1r3P2/PPkp4/R1n3p1/2Q4R/K2N4 w - - 0 1)

van Gool, Johann Christoffel

Schakend Nederland, 1980

4BB2/q7/2N5/1r3P2/PPkp4/R1n3p1/2Q4R/K2N4

#2

11 + 6

15601 Albrecht-Leiss-Degener Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rd5
      • 2.Sb2#
    • 1...d3
      • 2.Qb3#
  • Tries
    • 1.Bf7+?
      • 1...Rd5
        • 2.Sb2#
        • 2.Se5#
      • 1...Qxf7!
    • 1.Rd2?
      • threat
        • 2.Qb3#
      • 1...Kd5
        • 2.Se3#
      • 1...Qxa4
        • 2.Rxd4#
      • 1...Rxb4!
    • 1.Rh4?
      • threat
        • 2.Se3#
      • 1...Kd5
        • 2.Qb3#
      • 1...Qe7
        • 2.Rxd4#
      • 1...Re5!
    • 1.Rxc3+?
      • 1...Kd5
        • 2.Qg2#
      • 1...dxc3!
    • 1.Qd3+?
      • 1...Kd5
        • 2.Sxc3#
        • 2.Se3#
      • 1...Kxd3!
    • 1.Qa2+?
      • 1...Kd3
        • 2.Qe2#
      • 1...Sxa2!
  • Keys
    • 1.Qg2!
      • threat
        • 2.Sb2#
      • 1...Kd3
        • 2.Qe2#
      • 1...Rxb4
        • 2.Se5#
      • 1...Sxd1
        • 2.Qa2#
      • 1...Sxa4
        • 2.Qa2#
      • 1...Se4
        • 2.Qa2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • R(e);SBLOCK::S(B)
    • P(d);SBLOCK::QAB1(C)
  • Tries
    • Try
      • B(J);CHECK
      • Refutation
        • Q(f);XB(J)
    • Try
      • R(D);
      • Threat
        • QAB1(C)
      • Vars
        • K(c);N_SPINS(a),P_SPINP(d),S_FLIGHT::S(B)
        • Q(f);N_GUARD,P_PINR(E),XP(F)::R1(D),XP(d)
      • Refutation
        • R(e);XP(G)
    • Try
      • R(D);P_PINP(d)
      • Threat
        • S(B)
      • Vars
        • K(c);N_SPINP(d),N_SPINS(a),S_FLIGHT::QAB(C)
        • Q(f);N_GUARD::R1(D),XP(d)
      • Refutation
        • R(e);
    • Try
      • R(E);CHECK,P_SPINP(F),XS(a)
      • Vars
        • K(c);S_FLIGHT::QAB(C)
      • Refutation
        • P(d);P_SPINP(d),XR(E)
    • Try
      • Q(C);CHECK,N_PINS(a)
      • Refutation
        • K(c);P_SPINS(a),S_FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK,N_PINS(a)
      • Vars
        • K(c);P_SPINS(a),S_FLIGHT::QAB1(C)
      • Refutation
        • S(a);XQ(C)
  • Actual
    • Q(C);N_PINS(a)
    • Threat
      • S(B)
    • Vars
      • K(c);P_SPINS(a),S_FLIGHT::QAB1(C)
      • R(e);N_GUARD,XP(G)::S(I)
      • S(a);N_GUARD,XS(B)::QAB(C)
      • S(a);N_GUARD,XP(F)::QAB(C)
      • S(a);N_GUARD::QAB(C)
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