MESON Chess Problem Database

Problem Display
PID: 226725 (B3RB2/1n3NK1/npp2pP1/3k1p1Q/4NP1q/4P2b/p1R5/r7 w - - 0 1)

Shire, David J

4th Prize, Die Schwalbe, 2020

B3RB2/1n3NK1/npp2pP1/3k1p1Q/4NP1q/4P2b/p1R5/r7

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Sxf6#
    • 1...Qf2
      • 2.Sxf6#
    • 1...Qg3
      • 2.Sxf6#
    • 1...Qxf4
      • 2.Sxf6#
    • 1...Qg4
      • 2.Sxf6#
    • 1...Qxh5
      • 2.Sxf6#
    • 1...Rd1
      • 2.Qxd1#
    • 1...Bf1
      • 2.Qxf5#
    • 1...Bg2
      • 2.Qxf5#
    • 1...Sd6
      • 2.Bxc6#
    • 1...c5
      • 2.Bxb7#
  • Tries
    • 1.Sfd6?
      • threat
        • 2.Rd2#
      • 1...Sxd6
        • 2.Bxc6#
      • 1...c5
        • 2.Bxb7#
      • 1...Qe1
        • 2.Sxf6#
      • 1...Qf2
        • 2.Sxf6#
      • 1...Rd1
        • 2.Qxd1#
      • 1...Bf1
        • 2.Qxf5#
      • 1...Sac5
        • 2.Sc3#
      • 1...Sbc5
        • 2.Sc3#
      • 1...Sb4!
    • 1.Qxh4?
      • threat
        • 2.Sxf6#
      • 1...c5
        • 2.Bxb7#
      • 1...fxe4!
  • Keys
    • 1.Se5!
      • threat
        • 2.Sc3#
      • 1...Kxe4
        • 2.Qf3#
      • 1...fxe4
        • 2.Rd2#
      • 1...fxe5
        • 2.Rxe5#
      • 1...Qe1
        • 2.Sxf6#
      • 1...Sd6
        • 2.Bxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • Q(d);N_GUARD::S(C),XP(j)
    • Q(d);N_GUARD,P_PINP(F)::S(C),XP(j)
    • Q(d);N_GUARD,XP(D)::S(C),XP(j)
    • Q(d);N_GUARD,N_SPINP(f),XQ(E)::S(C),XP(j)
    • R(a);N_GUARD::QAR(E),XR(a)
    • B(c);N_GUARD::QAR2(E),XP(f)
    • S(k);OGATE::B(I),XP(i)
    • P(i);OGATEB,P_SPINS(k)::B(I),XS(k)
  • Tries
    • Try
      • S(G);
      • Threat
        • R(A)
      • Vars
        • S(k);OGATE,XS(G)::B(I),XP(i)
        • P(i);OGATEB,P_SPINS(k)::B(I),XS(k)
        • Q(d);N_GUARD::S(C),XP(j)
        • R(a);N_GUARD::QAR(E),XR(a)
        • B(c);N_GUARD::QAR2(E),XP(f)
        • S(g);SBLOCK::S(C)
        • S(k);SBLOCK::S(C)
      • Refutation
        • S(g);
    • Try
      • Q(E);N_PINP(f),XQ(d)
      • Threat
        • S(C),XP(j)
      • Vars
        • P(i);OGATEB,P_SPINS(k)::B(I),XS(k)
      • Refutation
        • P(f);XS(C)
  • Actual
    • S(G);N_PINP(f)
    • Threat
      • S(C)
    • Vars
      • K(e);OGATEB,S_FLIGHT,XS(C)::QAB1(E)
      • P(f);SBLOCK,XS(C)::R(A)
      • P(j);OGATE,XS(G)::R1(J),XP(j)
      • Q(d);N_GUARD::S(C),XP(j)
      • S(k);OGATE,P_SPINP(i)::B(I),XP(i)
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