MESON Chess Problem Database

Problem Display
PID: 25696 (4N3/Q3P3/1rP3K1/RPk2PR1/1N1pqp2/PP1p4/8/8 w - - 0 1)

Stocchi, Ottavio

La Settimana Enigmistica, 1932

4N3/Q3P3/1rP3K1/RPk2PR1/1N1pqp2/PP1p4/8/8

#2

12 + 6

1101 BCSC Final 2000-2001
136 Problem Observer 2001
3100 Selected Stocchi (I) 2001

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Sxd3#
      • 2.Sa6#
    • 1...Qxf5+
      • 2.Rxf5#
    • 1...Qxc6+
      • 2.bxc6#
    • 1...Qe6+
      • 2.fxe6#
    • 1...Qxe7
      • 2.Qxe7#
  • Tries
    • 1.Sxd3+?
      • 1...Kd5
        • 2.Qd7#
      • 1...Qxd3!
    • 1.Ra6?
      • threat
        • 2.Qxb6#
      • 1...Qxf5+
        • 2.Rxf5#
      • 1...Qe6+
        • 2.fxe6#
      • 1...Kxb5
        • 2.Ra5#
        • 2.Qxb6#
      • 1...Qxc6+!
  • Keys
    • 1.Qc7!
      • threat
        • 2.Qd6#
      • 1...Qxf5+
        • 2.Rxf5#
      • 1...Qxc6+
        • 2.f6#
      • 1...Qe6+
        • 2.fxe6#
      • 1...Rxc6+
        • 2.bxc6#
      • 1...Qxe7
        • 2.Qxe7#
      • 1...Rxb5
        • 2.Qa7#
      • 1...Qd5
        • 2.Sxd3#
      • 1...Qe5
        • 2.Qxe5#
      • 1...Ra6
        • 2.bxa6#
      • 1...Rb7
        • 2.b6#
      • 1...Rb8
        • 2.b6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • Q(c);CHECK,OGATE,P_PINP(H),P_SPINQ(c),XP(F)::R(G),XQ(c)
    • Q(c);CHECK,N_PINP(F),OGATE,XP(H)::R(D)+P(E),XQ(c)
    • Q(c);CHECK,N_PINP(F)::R(G)+P(F),XQ(c)
    • Q(c);N_PINP(F),OGATE,P_PINP(H),XP(K)::QAB(J),XQ(c)
  • Tries
    • Try
      • S(C);CHECK,XP(a)
      • Vars
        • K(e);N_SPINR(f),P-FLIGHT::QAR2(J)
      • Refutation
        • Q(c);XS(C)
    • Try
      • R(D);
      • Threat
        • QAB1(J),XR(f)
      • Vars
        • Q(c);CHECK,OGATE,P_PINP(H),P_SPINQ(c),XP(F)::R(G),XQ(c)
        • Q(c);CHECK,N_PINP(F)::R(G)+P(F),XQ(c)
      • Refutation
        • Q(c);CHECK,N_PINP(F),XP(H)
  • Actual
    • Q(J);N_PINR(f)
    • Threat
      • QAB1(J)
    • Vars
      • Q(c);CHECK,OGATE,P_PINP(H),P_SPINQ(c),XP(F)::R(G),XQ(c)
      • Q(c);CHECK,N_PINP(F),P_SPINQ(c),XP(H)::R(G)+P(F)
      • Q(c);CHECK,N_PINP(F)::R(G)+P(F),XQ(c)
      • R(f);CHECK,OGATE,P_SPINR(f),XP(H)::R(D)+P(E),XR(f)
      • Q(c);N_PINP(F),OGATE,P_PINP(H),XP(K)::QAB(J),XQ(c)
      • R(f);OGATEB,P_SPINR(f),XP(E)::QAB(J)
      • Q(c);N_GUARD,N_PINP(F),P_PINP(H),SBLOCK::S(C),XP(a)
      • Q(c);N_GUARD,N_PINP(F),P_PINP(H)::QAR2(J),XQ(c)
      • R(f);OGATE::R(D)+P(E),XR(f)
      • R(f);OGATE::R(D)+P(E)
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