MESON Chess Problem Database

Problem Display
PID: 268353 (1Bn1R3/2q1P3/1p2N3/1rp4n/1Pp1k1PK/1B1R1Npp/2PPr3/7Q w - - 0 1)

Forster, Klaus

Die Schwalbe, 2022

1Bn1R3/2q1P3/1p2N3/1rp4n/1Pp1k1PK/1B1R1Npp/2PPr3/7Q

#2

13 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4
      • 2.Sfg5#
    • 1...Qe5
      • 2.Sfg5#
    • 1...Qd8
      • 2.Sfg5#
      • 2.Seg5#
    • 1...Qc6
      • 2.Sfg5#
      • 2.Seg5#
    • 1...Qa7
      • 2.Sfg5#
      • 2.Seg5#
    • 1...Qb7
      • 2.Sfg5#
      • 2.Seg5#
    • 1...Qd7
      • 2.Sfg5#
      • 2.Seg5#
    • 1...Qxe7+
      • 2.Sfg5#
      • 2.Seg5#
    • 1...Re1
      • 2.Qxe1#
    • 1...Sf4
      • 2.Seg5#
    • 1...c3
      • 2.Bd5#
    • 1...cxb4
      • 2.Rd4#
  • Tries
    • 1.Bxc7?
      • threat
        • 2.Sfg5#
        • 2.Seg5#
      • 1...cxb4
        • 2.Sfg5#
        • 2.Rd4#
      • 1...Sd6!
    • 1.Rf8?
      • threat
        • 2.Seg5#
      • 1...Qxe7+
        • 2.Sfg5#
      • 1...cxb4
        • 2.Rd4#
      • 1...Qf4
        • 2.Sfg5#
      • 1...Qe5
        • 2.Sfg5#
      • 1...Sf6!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Sfg5#
      • 1...Qxe7+
        • 2.Seg5#
      • 1...cxb4
        • 2.Qd4#
      • 1...Qf4
        • 2.Qa8#
      • 1...Qe5
        • 2.Qxe5#
      • 1...c3
        • 2.Bd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • Q(j);P_PINP(H)::QAB(A)+S(F),DCHECK
    • Q(j);::QAB(A)+S(F),DCHECK
    • R(a);OGATEB::QAR(A),XR(a)
    • S(h);SBLOCK::S(J)
    • P(d);OGATE::B(D)
    • P(g);N_GUARD,XP(G)::R1(E)
  • Tries
    • Try
      • B(L);XQ(j)
      • Threat
        • DUALS(2)
      • Refutation
        • S(k);
    • Try
      • R(M);
      • Threat
        • S(J)
      • Vars
        • Q(j);CHECK,XP(K)::QAB(A)+S(F),DCHECK
        • P(g);N_GUARD,XP(G)::R1(E)
        • Q(j);P_PINP(H)::QAB(A)+S(F),DCHECK
        • Q(j);::QAB(A)+S(F),DCHECK
      • Refutation
        • S(h);
  • Actual
    • Q(A);
    • Threat
      • S(F)
    • Vars
      • Q(j);CHECK,XP(K)::S(J)
      • P(g);N_GUARD,XP(G)::QAR1(A)
      • Q(j);N_GUARD,P_PINP(H)::QAB(A)
      • Q(j);N_GUARD::QAR1(A),XQ(j)
      • P(d);OGATE::B(D)
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