MESON Chess Problem Database

Problem Display
PID: 163502 (2R4B/b2K3N/3N4/1n1k1pp1/r7/3P4/b1nR4/1Q4q1 w - - 0 1)

Ott, Thierry

Basler Zeitung, 1977

2R4B/b2K3N/3N4/1n1k1pp1/r7/3P4/b1nR4/1Q4q1

#2

8 + 9

15601 Albrecht-Leiss-Degener Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Rc4
      • 2.dxc4#
    • 1...Re4
      • 2.dxe4#
    • 1...Bc4
      • 2.dxc4#
    • 1...Sa3
      • 2.Qb7#
    • 1...Sc3
      • 2.Qb7#
  • Tries
    • 1.Qxa2+?
      • 1...Rc4
        • 2.Qxc4#
        • 2.dxc4#
      • 1...Rxa2!
    • 1.Qb3+?
      • 1...Rc4
        • 2.dxc4#
      • 1...Bxb3!
    • 1.Qxb5+?
      • 1...Bc5
        • 2.Qc6#
        • 2.Qb7#
      • 1...Qc5!
  • Keys
    • 1.d4!
      • threat
        • 2.Sf6#
      • 1...Qxd4
        • 2.Qh1#
      • 1...Rxd4
        • 2.Qxa2#
      • 1...Bxd4
        • 2.Qxb5#
      • 1...Scxd4
        • 2.Qxf5#
      • 1...Sbxd4
        • 2.Qb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • R(d);OGATE::R(B)+P(C)DCHECK,XR(d)
    • B(b);OGATE::R(B)+P(C)DCHECK,XB(b)
    • S(e);OGATE::QAB(A)
  • Tries
    • Try
      • Q(A);CHECK,XB(b)
      • Refutation
        • R(d);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • R(d);OGATE,P_SPINR(d)::R(B)+P(C)DCHECK,XR(d)
      • Refutation
        • B(b);XQ(A)
    • Try
      • Q(A);CHECK,XS(e)
      • Refutation
        • Q(a);P_SPINQ(a)
  • Actual
    • P(C);
    • Threat
      • S(F)
    • Vars
      • Q(a);OGATE,P_SPINQ(a),XP(C)::QAB(A)
      • R(d);N_GUARD,P_SPINR(d),XP(C)::QAB(A),XB(b)
      • B(i);N_GUARD,P_SPINB(i),XP(C)::QAR2(A),XS(e)
      • S(c);OGATE,P_SPINS(c),XP(C)::QAR2(A),XP(g)
      • S(e);OGATE,P_SPINS(e),XP(C)::QAB(A)
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