MESON Chess Problem Database

Problem Display
PID: 71404 (8/6K1/bN5R/pk3PRp/2p1p2r/PpQ5/2PP1B2/qN2r1bB w - - 0 1)

Castellari, Umberto

1st Prize, La Settimana Enigmistica, 1933

8/6K1/bN5R/pk3PRp/2p1p2r/PpQ5/2PP1B2/qN2r1bB

#2

12 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.a4#
    • 1...Qxc3+
      • 2.Sxc3#
    • 1...Qxb1
      • 2.Qe5#
      • 2.Qxc4#
      • 2.a4#
    • 1...Qa2
      • 2.Qe5#
      • 2.Qxc4#
    • 1...Qxa3
      • 2.Sxa3#
      • 2.Qxc4#
    • 1...b2
      • 2.Qe5#
      • 2.Qxc4#
  • Tries
    • 1.Kf7?
      • threat
        • 2.Qxc4#
      • 1...Qxc3
        • 2.Sxc3#
      • 1...a4
        • 2.Qb4#
      • 1...e3!
    • 1.Kh7?
      • threat
        • 2.Qxc4#
      • 1...Qxc3
        • 2.Sxc3#
      • 1...a4
        • 2.Qb4#
      • 1...e3!
    • 1.Kf8?
      • threat
        • 2.Qxc4#
      • 1...Qxa3+
        • 2.Sxa3#
      • 1...Qxc3
        • 2.Sxc3#
      • 1...a4
        • 2.Qb4#
      • 1...e3!
    • 1.Kg8?
      • threat
        • 2.Qxc4#
      • 1...Qxc3
        • 2.Sxc3#
      • 1...a4
        • 2.Qb4#
      • 1...e3!
    • 1.Bd4?
      • threat
        • 2.Qxc4#
      • 1...Qxc3
        • 2.Sxc3#
      • 1...a4
        • 2.Qb4#
      • 1...Bxd4+!
    • 1.Rf6?
      • threat
        • 2.Qxc4#
      • 1...Qxc3
        • 2.Sxc3#
      • 1...a4
        • 2.Qb4#
      • 1...e3!
  • Keys
    • 1.d4!
      • threat
        • 2.Qxc4#
      • 1...Qxc3
        • 2.Sxc3#
      • 1...cxd4 ep
        • 2.f6#
      • 1...exd4 ep
        • 2.Bc6#
      • 1...a4
        • 2.Qb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(a);N_GUARD::P(F)
    • Q(a);CHECK,XQ(G)::S(A),XQ(a)
  • Tries
    • Try
      • K(L);N_SPINQ(G),P-FLIGHT
      • Threat
        • QAB1(G),XP(e)
      • Vars
        • Q(a);XQ(G)::S(A),XQ(a)
        • P(h);N_GUARD::QAR1(G)
      • Refutation
        • P(f);
    • Try
      • K(L);N_SPINQ(G),P-FLIGHT
      • Threat
        • QAB1(G),XP(e)
      • Vars
        • Q(a);XQ(G)::S(A),XQ(a)
        • P(h);N_GUARD::QAR1(G)
      • Refutation
        • P(f);
    • Try
      • K(L);N_SPINQ(G),S_FLIGHT
      • Threat
        • QAB1(G),XP(e)
      • Vars
        • Q(a);CHECK,XP(F)::S(A),XQ(a)
        • Q(a);XQ(G)::S(A),XQ(a)
        • P(h);N_GUARD::QAR1(G)
      • Refutation
        • P(f);
    • Try
      • K(L);N_SPINQ(G),P-FLIGHT
      • Threat
        • QAB1(G),XP(e)
      • Vars
        • Q(a);XQ(G)::S(A),XQ(a)
        • P(h);N_GUARD::QAR1(G)
      • Refutation
        • P(f);
    • Try
      • B(E);N_SPINQ(G)
      • Threat
        • QAB1(G),XP(e)
      • Vars
        • Q(a);P_PINB(E),XQ(G)::S(A),XQ(a)
        • P(h);N_GUARD::QAR1(G)
      • Refutation
        • B(c);CHECK,XB(E)
    • Try
      • R(K);N_SPINQ(G)
      • Threat
        • QAB1(G),XP(e)
      • Vars
        • Q(a);P_PINR(K),XQ(G)::S(A),XQ(a)
        • P(h);N_GUARD::QAR1(G)
      • Refutation
        • P(f);
  • Actual
    • P(D);N_SPINQ(G)
    • Threat
      • QAB1(G),XP(e)
    • Vars
      • Q(a);P_PINP(D),XQ(G)::S(A),XQ(a)
      • P(e);EP,P_PINQ(G),XP(D)::R(I)+P(H)
      • P(f);EP,OGATE,P_PINQ(G),XP(D)::B(B)
      • P(h);N_GUARD::QAR1(G)
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