MESON Chess Problem Database

Problem Display
PID: 45717 (8/4pQNp/p1pprb2/R1nPk1p1/1K4P1/p1Pp1PP1/1B6/7B w - - 0 1)

Hirschenson, Aaron

Problem (Zagreb), 1979

8/4pQNp/p1pprb2/R1nPk1p1/1K4P1/p1Pp1PP1/1B6/7B

#2

11 + 12

3841 The Art of Israeli Chess Composition 1983
56 The Problemist 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd5
      • 2.Qxe6#
      • 2.c4#
      • 2.f4#
    • 1...Bxg7
      • 2.Qf5#
    • 1...Sb3
      • 2.Qxe6#
    • 1...Sa4
      • 2.Qxe6#
    • 1...Se4
      • 2.Qxe6#
    • 1...Sb7
      • 2.Qxe6#
    • 1...Sd7
      • 2.Qxe6#
    • 1...a2
      • 2.c4#
  • Tries
    • 1.Kxa3?
      • threat
        • 2.c4#
      • 1...Kxd5
        • 2.Qxe6#
      • 1...Sb3
        • 2.Qxe6#
      • 1...Sa4
        • 2.Qxe6#
      • 1...Se4
        • 2.Qxe6#
      • 1...cxd5!
    • 1.Ba1?
      • threat
        • 2.c4#
      • 1...Kxd5
        • 2.Qxe6#
        • 2.c4#
        • 2.f4#
      • 1...Sb3
        • 2.Qxe6#
      • 1...Sa4
        • 2.Qxe6#
      • 1...Se4
        • 2.Qxe6#
      • 1...cxd5!
    • 1.Qg6?
      • threat
        • 2.Qf5#
      • 1...Kxd5
        • 2.c4#
      • 1...hxg6!
    • 1.dxc6?
      • threat
        • 2.Qxe6#
      • 1...Kd5
        • 2.f4#
      • 1...Bxg7
        • 2.Qf5#
      • 1...d5!
  • Keys
    • 1.Qh5!
      • threat
        • 2.f4#
      • 1...Kxd5
        • 2.c4#
      • 1...Bxg7
        • 2.Qxg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • B(j);OGATE,XS(K)::QAR1(J)
    • S(c);N_GUARD::QAR1(J),XR(i)
    • P(a);N_GUARD::B(B)+P(C)
  • Tries
    • Try
      • K(F);S_FLIGHT,XP(a)
      • Threat
        • B(B)+P(C)
      • Vars
        • K(d);P-FLIGHT,P_SPINR(i),P_SPINS(c),XP(I)::QAB1(J),XR(i)
        • S(c);N_GUARD::QAR1(J),XR(i)
      • Refutation
        • P(g);XP(I)
    • Try
      • B(B);
      • Threat
        • B(B)+P(C)
      • Vars
        • S(c);N_GUARD::QAR1(J),XR(i)
      • Refutation
        • P(g);XP(I)
    • Try
      • Q(J);
      • Threat
        • QAR1(J)
      • Vars
        • K(d);P-FLIGHT,P_SPINS(c),XP(I)::P(C)
      • Refutation
        • P(l);XQ(J)
    • Try
      • P(I);P_PINS(c),XP(g)
      • Threat
        • QAR1(J),XR(i)
      • Vars
        • K(d);P-FLIGHT,P_SPINR(i)::B(A)+P(D)
        • B(j);OGATE,XS(K)::QAR1(J)
      • Refutation
        • P(h);N_SPINS(c)
  • Actual
    • Q(J);P_PINP(e)
    • Threat
      • P(D)
    • Vars
      • K(d);P-FLIGHT,P_SPINS(c),XP(I)::P(C)
      • B(j);N_GUARD,XS(K)::QAR2(J),XP(e)
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