MESON Chess Problem Database

Problem Display
PID: 232826 (5N2/4qQ2/5n2/2r2kbb/2r1RB1n/1B2RNK1/8/8 w - - 0 1)

Koller, Paul

Freie Presse, 1972

5N2/4qQ2/5n2/2r2kbb/2r1RB1n/1B2RNK1/8/8

#2

8 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qd8
      • 2.Qe6#
    • 1...Qe6
      • 2.Qxe6#
    • 1...Qa7
      • 2.Qe6#
    • 1...Qb7
      • 2.Qe6#
    • 1...Qc7
      • 2.Qe6#
    • 1...Rc1
      • 2.Sd4#
    • 1...Rc2
      • 2.Sd4#
    • 1...Rc3
      • 2.Sd4#
    • 1...Rd4
      • 2.Sxd4#
    • 1...Bh6
      • 2.Sxh4#
  • Keys
    • 1.Bc2!
      • threat
        • 2.Re5#
      • 1...Bxf4+
        • 2.Rxf4#
      • 1...Qxe4
        • 2.Qe6#
      • 1...Rxc2
        • 2.Sd4#
      • 1...Rxe4
        • 2.Sd4#
      • 1...Qe5
        • 2.Rxe5#
      • 1...Re5
        • 2.Rxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 9
  • Sets
    • Q(h);N_GUARD::QAB1(G)
    • Q(h);N_GUARD::QAB1(G),XQ(h)
    • Q(h);N_GUARD,P_PINB(F)::QAB1(G)
    • R(a);N_GUARD::S(C)
    • R(a);N_GUARD::S(C),XR(a)
    • B(e);N_GUARD::S(C),XS(b)
  • Actual
    • B(A);
    • Threat
      • B(A)+R(E),DCHECK
    • Vars
      • B(e);CHECK,OGATE,XB(F)::B(A)+R(E),DCHECK,XB(e)
      • Q(h);N_GUARD,P_SPINQ(h),XR(E)::QAB1(G)
      • R(a);N_GUARD,XB(A)::S(C)
      • R(a);N_GUARD,P_SPINR(a),XR(E)::S(C)
      • Q(h);P_PINB(F)::B(A)+R(E),DCHECK,XQ(h)
      • R(c);::B(A)+R(E),DCHECK,XR(c)
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