MESON Chess Problem Database

Problem Display
PID: 18568 (8/p1p4b/Q3Pr1n/4P3/K1p5/2Pk1Pp1/R3N1Nb/7r w - - 0 1)

Apro, Laszlo

1st HM., Suomen Shakki, 1956

8/p1p4b/Q3Pr1n/4P3/K1p5/2Pk1Pp1/R3N1Nb/7r

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...c5
      • 2.Qd6#
  • Tries
    • 1.Qb7?
      • threat
        • 2.Qd5#
      • 1...Bg1
        • 2.Qb1#
      • 1...Be4
        • 2.Qxe4#
      • 1...Sf5
        • 2.Qe4#
      • 1...c6
        • 2.Qd7#
      • 1...Rf4!
    • 1.Qa5?
      • threat
        • 2.Qd5#
      • 1...Rf4
        • 2.Sexf4#
      • 1...Bg1
        • 2.Sc1#
      • 1...Sf5
        • 2.Sef4#
      • 1...c5
        • 2.Qd8#
      • 1...c6
        • 2.Qd8#
      • 1...Be4!
  • Keys
    • 1.Qxa7!
      • threat
        • 2.Qe3#
        • 2.Qd4#
      • 1...Rxf3
        • 2.Qd4#
      • 1...Rf4
        • 2.Sgxf4#
        • 2.Qe3#
      • 1...Bg1
        • 2.Se1#
      • 1...Sg4
        • 2.Qd4#
      • 1...Sf5
        • 2.Sgf4#
      • 1...c5
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(i);N_GUARD::QAR(H)
  • Tries
    • Try
      • Q(H);N_PINP(e)
      • Threat
        • QAR2(H)
      • Vars
        • B(b);S_CUTR(a)::QAB(H)
        • B(j);N_GUARD::QAB1(H),XB(j)
        • S(g);S_CUTB(j)::QAB1(H)
        • P(i);OGATE::QAR(H)
      • Refutation
        • R(f);
    • Try
      • Q(H);N_PINP(e)
      • Threat
        • QAR2(H)
      • Vars
        • R(f);N_GUARD::S(B),XR(f)
        • B(b);S_CUTR(a)::S(B)
        • S(g);S_CUTR(f)::S(B)
        • P(i);OGATE::QAR(H)
      • Refutation
        • B(j);
  • Actual
    • Q(H);N_PINP(e),XP(h)
    • Threat
      • DUALS(2)
    • Vars
      • R(f);XP(E)::QAR1(H)
      • B(b);S_CUTR(a)::S(C)
      • S(g);::QAR1(H)
      • S(g);S_CUTR(f)::S(C)
      • P(i);OGATE::QAR(H)
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