MESON Chess Problem Database

Problem Display
PID: 161868 (5B2/K2Q2p1/nP1P1b2/6R1/1ppkpP2/1q1r1b2/1p1NPP2/1N6 w - - 0 1)

Apro, Laszlo

Budapesti Sakkszovetseg, 1961

5B2/K2Q2p1/nP1P1b2/6R1/1ppkpP2/1q1r1b2/1p1NPP2/1N6

#2

11 + 11

15148 Sadier Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Be7
      • 2.dxe7#
    • 1...Sc7
      • 2.dxc7#
  • Tries
    • 1.Bxg7?
      • threat
        • 2.Bxf6#
      • 1...Bxg7
        • 2.Qxg7#
      • 1...Be5!
    • 1.Qb5?
      • threat
        • 2.Rd5#
        • 2.Qd5#
      • 1...Bxg5
        • 2.Qe5#
      • 1...Be5
        • 2.Qxe5#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sc7
        • 2.Qc5#
      • 1...c3
        • 2.Sxb3#
      • 1...e3!
    • 1.Qf5?
      • threat
        • 2.Qd5#
      • 1...Bxg5
        • 2.Qe5#
      • 1...Be5
        • 2.Qxe5#
      • 1...Sc7
        • 2.Qc5#
      • 1...e3
        • 2.Sxf3#
      • 1...c3!
    • 1.Qe6?
      • threat
        • 2.Rd5#
        • 2.Qd5#
      • 1...Bxg5
        • 2.Qe5#
      • 1...Be5
        • 2.Qxe5#
      • 1...c3
        • 2.Sxb3#
      • 1...e3
        • 2.Sxf3#
      • 1...Sc7!
  • Keys
    • 1.Qxg7!
      • threat
        • 2.Qxf6#
      • 1...Bxg7
        • 2.Bxg7#
      • 1...Be5
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(j);OGATE::QAR(J)+P(H),XB(j)
    • S(i);OGATE::QAR(J)+P(H),XS(i)
  • Tries
    • Try
      • B(K);P_PINB(j),XP(k)
      • Threat
        • B(K),XB(j)
      • Vars
        • B(j);N_SPINB(j),OGATE,XB(K)::QAB(J),XB(j)
      • Refutation
        • B(j);
    • Try
      • Q(J);
      • Threat
        • DUALS(2)
      • Vars
        • B(j);N_GUARD,XR(F)::QAB1(J)
        • B(j);N_GUARD::QAB1(J),XB(j)
        • S(i);N_GUARD::QAB1(J),XS(i)
        • S(i);N_GUARD::QAB1(J)
        • P(f);N_GUARD,S_CUTR(c)::S(B),XQ(b)
      • Refutation
        • P(h);
    • Try
      • Q(J);
      • Threat
        • QAR1(J)
      • Vars
        • B(j);N_GUARD,XR(F)::QAB1(J)
        • B(j);N_GUARD::QAB1(J),XB(j)
        • S(i);N_GUARD::QAB1(J)
        • P(h);N_GUARD,S_CUTR(c)::S(B),XB(d)
      • Refutation
        • P(f);
    • Try
      • Q(J);
      • Threat
        • DUALS(2)
      • Vars
        • B(j);N_GUARD,XR(F)::QAB1(J)
        • B(j);N_GUARD::QAB1(J),XB(j)
        • P(f);N_GUARD,S_CUTR(c)::S(B),XQ(b)
        • P(h);N_GUARD,S_CUTR(c)::S(B),XB(d)
      • Refutation
        • S(i);
  • Actual
    • Q(J);P_PINB(j),XP(k)
    • Threat
      • QAB(J),XB(j)
    • Vars
      • B(j);N_SPINB(j),OGATE,XQ(J)::B(K),XB(j)
      • B(j);OGATE::QAB1(J),XB(j)
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