MESON Chess Problem Database

Problem Display
PID: 209519 (B7/4n1pQ/2r3Pn/2pqNNp1/2P1k3/3RP1B1/2P1K3/5R2 w - - 0 1)

Hahnel, Peter

Deutsche Schachblatter, 1984

B7/4n1pQ/2r3Pn/2pqNNp1/2P1k3/3RP1B1/2P1K3/5R2

#2

12 + 8

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc4
      • 2.Sd6#
    • 1...Qf7
      • 2.Sd6#
    • 1...Qg8
      • 2.Sd6#
    • 1...Qxd3+
      • 2.cxd3#
    • 1...Qd6
      • 2.Sxd6#
    • 1...Rd6
      • 2.Sxd6#
    • 1...Rxg6
      • 2.Sd6#
    • 1...Rc7
      • 2.Sd6#
    • 1...Rc8
      • 2.Sd6#
    • 1...Sg4
      • 2.Qh1#
    • 1...Shxf5
      • 2.Qh1#
    • 1...Sf7
      • 2.Qh1#
    • 1...Shg8
      • 2.Qh1#
  • Tries
    • 1.Qxh6?
      • threat
        • 2.Qh1#
      • 1...Qxd3+
        • 2.cxd3#
      • 1...gxh6!
  • Keys
    • 1.Sf7!
      • threat
        • 2.Sxg5#
      • 1...Qxd3+
        • 2.cxd3#
      • 1...Qxf7
        • 2.Sd6#
      • 1...Qxf5
        • 2.Sd6#
      • 1...Rxg6
        • 2.S5d6#
      • 1...Sxf7
        • 2.Qh1#
      • 1...g4
        • 2.Sg5#
        • 2.Rf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • Q(c);N_GUARD,P_PINR(D),P_SPINR(e),XP(G)::S(I)
    • Q(c);N_GUARD,P_SPINR(e)::S(I)
    • Q(c);CHECK,OGATE,P_SPINR(e),XR(D)::P(B),XQ(c)
    • Q(c);N_GUARD,P_SPINR(e)::S(I),XQ(c)
    • R(e);N_GUARD,P_SPINQ(c)::S(I),XR(e)
    • R(e);N_GUARD,P_SPINQ(c),XP(J)::S(I)
    • R(e);N_GUARD,P_SPINQ(c)::S(I)
    • S(f);OGATE::QAB(K)
    • S(f);OGATE,XS(I)::QAB(K)
  • Tries
    • Try
      • Q(K);XS(f)
      • Threat
        • QAB(K)
      • Vars
        • Q(c);CHECK,OGATE,P_SPINR(e),XR(D)::P(B),XQ(c)
      • Refutation
        • P(h);XQ(K)
  • Actual
    • S(H);
    • Threat
      • S(H),XP(d)
    • Vars
      • Q(c);CHECK,OGATE,P_SPINR(e),XR(D)::P(B),XQ(c)
      • Q(c);N_GUARD,P_SPINR(e),XS(H)::S(I)
      • Q(c);N_GUARD,P_SPINR(e),XS(I)::S(H)
      • R(e);N_GUARD,P_SPINQ(c),XP(J)::S(I)
      • S(f);OGATE,XS(H)::QAB(K)
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