MESON Chess Problem Database

Problem Display
PID: 25839 (r2nb3/nB1qP3/1N5Q/2kP1R2/2Pp2r1/P4NB1/7b/1R5K w - - 0 1)

Stocchi, Ottavio

4th Prize, La Settimana Enigmistica, 1932/II

r2nb3/nB1qP3/1N5Q/2kP1R2/2Pp2r1/P4NB1/7b/1R5K

#2

12 + 9

3100 Selected Stocchi (I) 2001
56 The Problemist 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Qa4
      • 2.Qd6#
      • 2.d6#
    • 1...Qb5
      • 2.Qd6#
    • 1...Qxf5
      • 2.Qd6#
    • 1...Qc6
      • 2.dxc6#
    • 1...Qe6
      • 2.dxe6#
    • 1...Qc8
      • 2.Qd6#
    • 1...Qxd5
      • 2.Rxd5#
      • 2.Qd6#
    • 1...Qd6
      • 2.Qxd6#
    • 1...Qxb7
      • 2.Qd6#
    • 1...Qc7
      • 2.d6#
    • 1...Sac6
      • 2.Rb5#
    • 1...Se6
      • 2.d6#
  • Tries
    • 1.Sa4+?
      • 1...Kxc4
        • 2.Se5#
      • 1...Qxa4!
    • 1.Rb5+?
      • 1...Qxb5
        • 2.Qd6#
      • 1...Sxb5!
    • 1.Qc6+?
      • 1...Qxc6
        • 2.dxc6#
      • 1...Saxc6
        • 2.Rb5#
      • 1...Sdxc6!
  • Keys
    • 1.Sd2!
      • threat
        • 2.Sb3#
      • 1...Qxd5+
        • 2.Rxd5#
      • 1...Rxg3
        • 2.Se4#
      • 1...Qa4
        • 2.Qd6#
        • 2.d6#
      • 1...Qb5
        • 2.Qd6#
      • 1...Qc6
        • 2.dxc6#
      • 1...Qe6
        • 2.dxe6#
      • 1...Qd6
        • 2.Qxd6#
      • 1...Rg6
        • 2.Se4#
      • 1...Bg6
        • 2.Sxd7#
      • 1...Sac6
        • 2.Rb5#
      • 1...Sdc6
        • 2.Sa4#
      • 1...Se6
        • 2.d6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • Q(f);N_GUARD::QAB1(J)
    • Q(f);N_GUARD,XR(H)::QAB1(J)
    • Q(f);OGATE::R(H)+P(G),XQ(f)
    • Q(f);N_GUARD::QAB1(J),XQ(f)
    • Q(f);N_GUARD,XB(K)::QAB1(J)
    • Q(f);N_GUARD::R(H)+P(G)
    • S(e);N_GUARD,S_CUTQ(f)::R1(A)
    • S(h);S_CUTQ(f)::R(H)+P(G)
  • Tries
    • Try
      • S(I);CHECK
      • Vars
        • K(d);P-FLIGHT,XP(F)::S(D)
      • Refutation
        • Q(f);XS(I)
    • Try
      • R(A);CHECK
      • Vars
        • Q(f);XR(A)::QAB1(J)
      • Refutation
        • S(e);XR(A)
    • Try
      • Q(J);CHECK
      • Vars
        • Q(f);OGATE,XQ(J)::R(H)+P(G),XQ(f)
        • S(e);XQ(J)::R1(A)
      • Refutation
        • S(h);XQ(J)
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • Q(f);CHECK,OGATE,P_SPINQ(f),XP(G)::R1(H),XQ(f)
      • R(c);N_GUARD,XB(E)::S(D)
      • Q(f);N_GUARD::QAB1(J)
      • Q(f);OGATE,P_PINP(G)::R(H)+P(G),XQ(f)
      • Q(f);OGATE::R(H)+P(G),XQ(f)
      • Q(f);N_GUARD::QAB1(J),XQ(f)
      • R(c);N_GUARD::S(D)
      • B(i);N_GUARD::S(I),XQ(f)
      • S(e);N_GUARD,S_CUTQ(f)::R1(A)
      • S(h);S_CUTQ(f)::S(I)
      • S(h);S_CUTQ(f)::R(H)+P(G)
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