MESON Chess Problem Database

Problem Display
PID: 77143 (4R1N1/3pB3/2ppNR2/2p1k1q1/2P2pp1/1n4Q1/1P1pP3/1B1K4 w - - 0 1)

Forster, Klaus

Die Schwalbe, 2007

4R1N1/3pB3/2ppNR2/2p1k1q1/2P2pp1/1n4Q1/1P1pP3/1B1K4

#2

11 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qh4
      • 2.Qxf4#
    • 1...Qxf6
      • 2.Bxf6#
    • 1...Qh5
      • 2.Qxf4#
    • 1...Qg6
      • 2.Qxf4#
    • 1...Qg7
      • 2.Qxf4#
    • 1...Qxg8
      • 2.Qxf4#
    • 1...Sa1
      • 2.Qc3#
    • 1...Sc1
      • 2.Qc3#
    • 1...Sa5
      • 2.Qc3#
  • Tries
    • 1.Sxf4?
      • threat
        • 2.Qe3#
      • 1...Kd4
        • 2.Qc3#
      • 1...Qxf4
        • 2.Qxf4#
      • 1...Qg6
        • 2.Se6#
      • 1...Qf5!
    • 1.Sxg5?
      • threat
        • 2.Qxf4#
      • 1...Kd4
        • 2.Qxf4#
        • 2.Qc3#
      • 1...fxg3!
    • 1.Rf5+?
      • 1...Kxe6
        • 2.Bxg5#
      • 1...Qxf5!
    • 1.Qxb3?
      • threat
        • 2.Qc3#
      • 1...Qxf6
        • 2.Bxf6#
      • 1...d5!
    • 1.Qd3?
      • threat
        • 2.Bxd6#
        • 2.Qe4#
        • 2.Qxd6#
      • 1...Qxg8
        • 2.Qe4#
        • 2.Qf5#
        • 2.Qxd6#
      • 1...Qf5
        • 2.Bxd6#
        • 2.Qxf5#
        • 2.Qxd6#
      • 1...Qg6
        • 2.Bxd6#
        • 2.Qxd6#
      • 1...Sd4
        • 2.Qe4#
      • 1...d5!
  • Keys
    • 1.Rxf4!
      • threat
        • 2.Qe3#
      • 1...Kxe6
        • 2.Bxg5#
      • 1...Qxf4
        • 2.Bf6#
      • 1...Qf5
        • 2.Re4#
      • 1...Qg6
        • 2.Rf6#

There are these versions: 79422

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(g);N_GUARD::QAB1(E),XP(c)
    • Q(g);OGATE,XR(H)::B(I),XQ(g)
    • Q(g);N_GUARD,XS(K)::QAB1(E),XP(c)
    • S(b);N_GUARD::QAB(E)
  • Tries
    • Try
      • S(G);XP(c)
      • Threat
        • QAR2(E)
      • Vars
        • K(f);S_FLIGHT::QAB1(E)
        • Q(g);OGATE,P_SPINQ(g),XS(G)::QAB1(E),XQ(g)
        • Q(g);N_GUARD::QAB(E)+S(G)
      • Refutation
        • Q(g);
    • Try
      • S(G);XQ(g)
      • Threat
        • QAB1(E),XP(c)
      • Refutation
        • P(c);N_SPINP(c),XQ(E)
    • Try
      • R(H);CHECK
      • Vars
        • K(f);N_SPINP(c),P-FLIGHT,XS(G)::R(J)+B(I),XQ(g)
      • Refutation
        • Q(g);XR(H)
    • Try
      • Q(E);N_PINP(c),XS(b)
      • Threat
        • QAB(E)
      • Vars
        • Q(g);OGATE,XR(H)::B(I),XQ(g)
      • Refutation
        • P(i);
    • Try
      • Q(E);N_PINP(c)
      • Threat
        • DUALS(3)
      • Vars
        • S(b);::QAR1(E)
      • Refutation
        • P(i);
  • Actual
    • R(H);XP(c)
    • Threat
      • QAR2(E)
    • Vars
      • K(f);OGATEB,P-FLIGHT,XS(G)::R(J)+B(I),XQ(g)
      • Q(g);N_GUARD,P_SPINQ(g),XR(H)::B(I)
      • Q(g);SBLOCK::QAB(E)+R(H),DCHECK
      • Q(g);N_GUARD::QAB(E)+R(H)
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