MESON Chess Problem Database

Problem Display
PID: 17677 (3r4/2n3RP/2Q5/3qB3/8/3N3B/8/3K3k w - - 0 1)

Dunhaupt, Dr Heinz Wilhelm

Schach-Express, 1948

3r4/2n3RP/2Q5/3qB3/8/3N3B/8/3K3k

#2

7 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Qg2
      • 2.Qxg2#
    • 1...Qf3+
      • 2.Qxf3#
    • 1...Qe4
      • 2.Qxe4#
  • Tries
    • 1.Ke1?
      • threat
        • 2.Sf2#
      • 1...Qe4+
        • 2.Qxe4#
      • 1...Qg2
        • 2.Qxg2#
      • 1...Rf8!
    • 1.Ke2?
      • threat
        • 2.Sf2#
        • 2.Qc1#
      • 1...Qg2+
        • 2.Qxg2#
      • 1...Qf3+
        • 2.Qxf3#
      • 1...Qe4+
        • 2.Qxe4#
      • 1...Qxc6
        • 2.Sf2#
      • 1...Rf8!
    • 1.Bg2+?
      • 1...Qxg2
        • 2.Qxg2#
      • 1...Kg1!
    • 1.Qxd5+?
      • 1...Sxd5
        • 2.Sf2#
      • 1...Rxd5!
  • Keys
    • 1.Bd7!
      • threat
        • 2.Qh6#
      • 1...Qf3+
        • 2.Qxf3#
      • 1...Qxc6
        • 2.Sf2#
      • 1...Qg2
        • 2.Qxg2#
      • 1...Qe4
        • 2.Sf2#
        • 2.Qxe4#
      • 1...Se6
        • 2.Qxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(b);OGATE::QAB1(E),XQ(b)
    • Q(b);CHECK,OGATE::QAB(E),XQ(b)
    • Q(b);OGATE::QAB(E),XQ(b)
  • Tries
    • Try
      • K(A);N_SPINS(B),P-FLIGHT
      • Threat
        • S(B)
      • Vars
        • Q(b);CHECK,OGATE::QAB(E),XQ(b)
        • Q(b);OGATE::QAB1(E),XQ(b)
      • Refutation
        • R(d);
    • Try
      • K(A);N_SPINS(B),S_FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);CHECK,OGATE::QAB1(E),XQ(b)
        • Q(b);CHECK,OGATE::QAB(E),XQ(b)
        • Q(b);N_SPINQ(b),XQ(E)::S(B)
      • Refutation
        • R(d);
    • Try
      • B(C);CHECK,N_PINQ(b)
      • Vars
        • Q(b);OGATE,P_SPINQ(b),XB(C)::QAB1(E),XQ(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(E);CHECK,N_SPINS(B),XQ(b)
      • Vars
        • S(c);XQ(E)::S(B)
      • Refutation
        • R(d);P_PINS(B),XQ(E)
  • Actual
    • B(C);
    • Threat
      • QAR(E)
    • Vars
      • Q(b);CHECK,N_PINS(B),OGATE::QAB(E),XQ(b)
      • Q(b);N_PINS(B),N_SPINQ(b),XQ(E)::S(B)
      • Q(b);N_PINS(B),OGATE::QAB1(E),XQ(b)
      • S(c);N_GUARD::QAB(E),XQ(b)
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