MESON Chess Problem Database

Problem Display
PID: 103975 (1bb4B/q3p2B/3RN3/1N6/PQPp2R1/1P3pr1/p2P1Kp1/k4nr1 w - - 0 1)

Johandl, Alois

Tolna megyei nepujsag, 1965-1966

1bb4B/q3p2B/3RN3/1N6/PQPp2R1/1P3pr1/p2P1Kp1/k4nr1

#2

12 + 12

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa4
      • 2.Bxd4#
    • 1...Qa5
      • 2.Bxd4#
    • 1...Qa6
      • 2.Bxd4#
    • 1...Qb7
      • 2.Bxd4#
    • 1...Qc7
      • 2.Bxd4#
    • 1...Qd7
      • 2.Bxd4#
    • 1...Qa8
      • 2.Bxd4#
  • Tries
    • 1.Sbxd4?
      • threat
        • 2.Qc3#
      • 1...Qxd4+
        • 2.Bxd4#
      • 1...Qa5
        • 2.Sb5#
      • 1...Kb2!
    • 1.Sexd4?
      • threat
        • 2.Qc3#
      • 1...Qxd4+
        • 2.Bxd4#
      • 1...Kb2
        • 2.Qc3#
      • 1...Qa5
        • 2.Se6#
      • 1...Bf5!
    • 1.Rgxd4?
      • threat
        • 2.Qc3#
      • 1...Qxd4+
        • 2.Bxd4#
      • 1...Kb2
        • 2.Qc3#
      • 1...Qa5
        • 2.Rg4#
      • 1...Rg6!
  • Keys
    • 1.Rdxd4!
      • threat
        • 2.Qc3#
      • 1...Qxd4+
        • 2.Bxd4#
      • 1...Kb2
        • 2.Qc3#
      • 1...Qa5
        • 2.Rd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(i);N_GUARD,XP(D)::B(L),XP(h)
    • Q(i);N_GUARD::B(L),XP(h)
  • Tries
    • Try
      • S(H);P_SPINS(H),XP(h)
      • Threat
        • QAB(E)
      • Vars
        • Q(i);CHECK,OGATE,P_SPINQ(i),XS(H)::B(L),XQ(i)
        • Q(i);N_PINS(H)::B(L)+S(H)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(J);P_SPINS(J),XP(h)
      • Threat
        • QAB(E)
      • Vars
        • Q(i);CHECK,OGATE,P_SPINQ(i),XS(J)::B(L),XQ(i)
        • K(a);S_FLIGHT::QAB1(E)
        • Q(i);N_PINS(J)::B(L)+S(J)
      • Refutation
        • B(l);
    • Try
      • R(G);P_SPINR(G),XP(h)
      • Threat
        • QAB(E)
      • Vars
        • Q(i);CHECK,OGATE,P_SPINQ(i),XR(G)::B(L),XQ(i)
        • K(a);S_FLIGHT::QAB1(E)
        • Q(i);N_PINR(G)::B(L)+R(G)
      • Refutation
        • R(g);
  • Actual
    • R(I);P_SPINR(I),XP(h)
    • Threat
      • QAB(E)
    • Vars
      • Q(i);CHECK,OGATE,P_SPINQ(i),XR(I)::B(L),XQ(i)
      • K(a);S_FLIGHT::QAB1(E)
      • Q(i);N_PINR(I)::B(L)+R(I)
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