MESON Chess Problem Database

Problem Display
PID: 24958 (8/b7/2Q5/8/1B5K/3b2R1/R3Pk2/4n2B w - - 0 1)

Niemeijer, Meindert

Front Ty., 1970

8/b7/2Q5/8/1B5K/3b2R1/R3Pk2/4n2B

#2

7 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sc2
      • 2.Qg2#
      • 2.Qf3#
    • 1...Sg2+
      • 2.Qxg2#
    • 1...Sf3+
      • 2.Qxf3#
  • Tries
    • 1.Bc5+?
      • 1...Kf1
        • 2.Rg1#
      • 1...Bxc5!
    • 1.Qc5+?
      • 1...Kf1
        • 2.Rg1#
      • 1...Bxc5!
    • 1.Qb6+?
      • 1...Kf1
        • 2.Rg1#
      • 1...Bxb6!
    • 1.Qf6+?
      • 1...Sf3+
        • 2.Qxf3#
      • 1...Bf5!
    • 1.exd3+?
      • 1...Sc2
        • 2.Qg2#
        • 2.Qf3#
      • 1...Kf1!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Qxe1#
      • 1...Sg2+
        • 2.Rxg2#
      • 1...Sf3+
        • 2.Rxf3#
      • 1...Kf1
        • 2.Qxe1#
      • 1...Sc2
        • 2.Rg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(a);CHECK,N_GUARD::QAR1(G),XS(a)
  • Tries
    • Try
      • B(E);CHECK
      • Vars
        • K(b);P-FLIGHT::R1(D)
      • Refutation
        • B(d);XB(E)
    • Try
      • Q(G);CHECK
      • Vars
        • K(b);P-FLIGHT::R1(D)
      • Refutation
        • B(d);XQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • K(b);P-FLIGHT::R1(D)
      • Refutation
        • B(d);XQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • S(a);CHECK,N_GUARD,P_SPINS(a)::QAR1(G),XS(a)
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • P(C);CHECK,XB(c)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(G);
    • Threat
      • QAB1(G),XS(a)
    • Vars
      • S(a);CHECK,N_GUARD::R1(D),XS(a)
      • K(b);P-FLIGHT,P_SPINS(a)::QAR1(G),XS(a)
      • S(a);N_GUARD::R1(D)
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