MESON Chess Problem Database

Problem Display
PID: 233183 (r1k5/2P1n1r1/p2B1p2/n1N5/K1N3q1/7Q/8/4R2B w - - 0 1)

Keller, Michael

Freie Presse, 1967

r1k5/2P1n1r1/p2B1p2/n1N5/K1N3q1/7Q/8/4R2B

#2

8 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxh3
      • 2.Sb6#
    • 1...Qf5
      • 2.Sb6#
    • 1...Qe6
      • 2.Sb6#
      • 2.Qxe6#
    • 1...Qd7+
      • 2.Qxd7#
    • 1...Rb8
      • 2.cxb8Q#
      • 2.cxb8R#
    • 1...Sb3
      • 2.Bb7#
    • 1...Sxc4
      • 2.Bb7#
    • 1...Sb7
      • 2.Bxb7#
    • 1...Sd5
      • 2.Re8#
    • 1...Sf5
      • 2.Re8#
    • 1...Sg6
      • 2.Re8#
    • 1...Sg8
      • 2.Re8#
  • Tries
    • 1.Kxa5?
      • threat
        • 2.Sb6#
        • 2.Bb7#
      • 1...Ra7
        • 2.Sb6#
      • 1...Rb8
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...Sd5
        • 2.Re8#
      • 1...Sc6+!
    • 1.Be4?
      • threat
        • 2.Sb6#
      • 1...Qd7+
        • 2.Qxd7#
      • 1...Sxc4
        • 2.Bb7#
      • 1...Rb8
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...Sd5!
    • 1.Re4?
      • threat
        • 2.Sb6#
      • 1...Qd7+
        • 2.Qxd7#
      • 1...Rb8
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...Sd5
        • 2.Re8#
      • 1...Sxc4!
    • 1.Qxg4+?
      • 1...Sf5
        • 2.Sb6#
        • 2.Re8#
      • 1...f5
        • 2.Sb6#
      • 1...Rxg4!
    • 1.Qh8+?
      • 1...Sg8
        • 2.Re8#
      • 1...Rg8!
  • Keys
    • 1.Bf4!
      • threat
        • 2.Sb6#
      • 1...Qd7+
        • 2.Qxd7#
      • 1...Sxc4
        • 2.Bb7#
      • 1...Rb8
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...Sd5
        • 2.Re8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 7
  • Sets
    • Q(a);N_PINS(E),N_SPINQ(a),XQ(C)::S(E)
    • Q(a);N_PINS(E)::S(E)
    • Q(a);CHECK,N_PINS(E),OGATE::QAB1(C),XQ(a)
    • R(g);OGATE::PXR(g)=Q
    • S(b);N_GUARD::B(B)
    • S(b);N_GUARD,XS(E)::B(B)
    • S(b);N_GUARD::B(B),XS(b)
    • S(e);OGATE::R(A)
    • S(e);N_SPINQ(a),OGATE::R(A)
  • Tries
    • Try
      • K(D);N_SPINS(E),P-FLIGHT,XS(b)
      • Threat
        • DUALS(2)
      • Vars
        • R(g);::S(E)
        • R(g);OGATE::PXR(g)=Q
        • S(e);OGATE::R(A)
      • Refutation
        • S(e);CHECK
    • Try
      • B(B);N_SPINS(E)
      • Threat
        • S(E)
      • Vars
        • Q(a);CHECK,OGATE::QAB1(C),XQ(a)
        • S(b);N_GUARD,XS(E)::B(B)
        • R(g);OGATE::PXR(g)=Q
      • Refutation
        • S(e);
    • Try
      • R(A);N_SPINS(E)
      • Threat
        • S(E)
      • Vars
        • Q(a);CHECK,OGATE::QAB1(C),XQ(a)
        • R(g);OGATE::PXR(g)=Q
        • S(e);OGATE::R(A)
      • Refutation
        • S(b);XS(E)
    • Try
      • Q(C);CHECK,N_SPINS(E),XQ(a)
      • Vars
        • P(d);P_SPINP(d)::S(E)
      • Refutation
        • R(f);P_PINS(E),XQ(C)
    • Try
      • Q(C);CHECK,N_PINQ(a)
      • Vars
        • S(e);OGATE,P_SPINS(e)::R(A)
      • Refutation
        • R(f);P_SPINR(f)
  • Actual
    • B(G);N_SPINS(E)
    • Threat
      • S(E)
    • Vars
      • Q(a);CHECK,OGATE::QAB1(C),XQ(a)
      • S(b);N_GUARD,XS(E)::B(B)
      • R(g);OGATE::PXR(g)=Q
      • S(e);OGATE::R(A)
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