MESON Chess Problem Database

Problem Display
PID: 64416 (6N1/5n1r/p1P5/3kP2q/2RN4/B4n1b/B2p1r2/KQ6 w - - 0 1)

Stocchi, Ottavio

2nd Prize, Polish Problem Association, 1952

6N1/5n1r/p1P5/3kP2q/2RN4/B4n1b/B2p1r2/KQ6

#2

9 + 9

5407 Selected Stocchi (II) 2004
5454 Near Snap 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe5
      • 2.Ra4#
    • 1...Sxd4
      • 2.Rc5#
    • 1...S3xe5
      • 2.Se7#
    • 1...S7xe5
      • 2.Sf6#
  • Tries
    • 1.Sb5?
      • threat
        • 2.Rc5#
      • 1...Qxe5+
        • 2.Rc3#
      • 1...Kxe5
        • 2.Qe4#
      • 1...Ke6
        • 2.Rc5#
      • 1...axb5!
    • 1.Rb4+?
      • 1...Kc5
        • 2.Ra4#
        • 2.Qc2#
      • 1...Kxe5!
  • Keys
    • 1.Se6!
      • threat
        • 2.Rc5#
      • 1...Qxe5+
        • 2.Rc3#
      • 1...Kxe5
        • 2.Qe4#
      • 1...Kxe6
        • 2.Rc5#
      • 1...Bxe6
        • 2.Qe4#
      • 1...S3xe5
        • 2.Sc7#
      • 1...S7xe5
        • 2.Sf4#

Anticipated by 16730(1942/I)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(f);P_PINS(F),SBLOCK,XP(G)::B(C)+R(E)
    • S(c);SBLOCK,XS(F)::B(C)+R(E),DCHECK
    • S(c);SBLOCK,XP(G)::S(I)
    • S(h);SBLOCK,XP(G)::S(I)
  • Tries
    • Try
      • S(F);
      • Threat
        • B(C)+R(E),DCHECK
      • Vars
        • Q(f);CHECK,SBLOCK,XP(G)::B(C)+R(E)
        • K(e);P-FLIGHT,XP(G)::QAR1(B)
        • K(e);S_FLIGHT::B(C)+R(E)
      • Refutation
        • P(g);XS(F)
    • Try
      • R(E);CHECK
      • Refutation
        • K(e);P-FLIGHT,XP(G)
  • Actual
    • S(F);
    • Threat
      • B(C)+R(E),DCHECK
    • Vars
      • Q(f);CHECK,SBLOCK,XP(G)::B(C)+R(E)
      • K(e);P-FLIGHT,XP(G)::QAR1(B)
      • K(e);S_FLIGHT,XS(F)::B(C)+R(E)
      • B(d);SBLOCK,XS(F)::QAB1(B)
      • S(c);SBLOCK,XP(G)::S(F)
      • S(h);SBLOCK,XP(G)::S(F)
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