MESON Chess Problem Database

Problem Display
PID: 151327 (2qr2B1/8/8/pR1NPNp1/2k2nQ1/4P3/4Pp2/BR1Kbn2 w - - 0 1)

Kovacevic, Marjan

1st Prize, Schach-Aktiv, 2009

2qr2B1/8/8/pR1NPNp1/2k2nQ1/4P3/4Pp2/BR1Kbn2

#2

11 + 9

23 Die Schwalbe 2013
56 The Problemist 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd5+
      • 2.Bxd5#
    • 1...Rd6
      • 2.Sxd6#
    • 1...Re8
      • 2.Sb6#
      • 2.Sd6#
    • 1...Rf8
      • 2.Sb6#
      • 2.Sd6#
    • 1...Rxg8
      • 2.Sb6#
      • 2.Sd6#
    • 1...Bd2
      • 2.Sb6#
    • 1...Sd2
      • 2.Sb6#
    • 1...Sxe3+
      • 2.Sxe3#
  • Tries
    • 1.Bd4?
      • threat
        • 2.Sb6#
      • 1...Sxe3+
        • 2.Sdxe3#
      • 1...Rxd5
        • 2.Sd6#
      • 1...Sxe2
        • 2.Qxe2#
      • 1...Sxd5
        • 2.Ba1#
      • 1...Bb4!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Sb6#
      • 1...Sxe3+
        • 2.Sxe3#
      • 1...Rxd5
        • 2.Qxc8#
      • 1...Sxe2
        • 2.Qxe2#
      • 1...Sxd5
        • 2.Sf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • R(i);CHECK,OGATE,P_SPINR(i),XS(H)::B(K),XR(i)
    • R(i);N_GUARD::S(J),XR(i)
    • B(a);N_PINS(H)::B(K)+S(H),DCHECK
    • S(b);N_PINS(H)::B(K)+S(H),DCHECK
    • S(b);CHECK,XP(E)::S(J),XS(b)
  • Tries
    • Try
      • B(A);N_PINS(e),N_SPINS(H)
      • Threat
        • B(K)+S(H),DCHECK
      • Vars
        • S(b);CHECK,XP(E)::B(K)+S(H),DCHECK,XS(b)
        • R(i);N_GUARD,P_PINB(A),P_SPINR(i),XS(H)::S(J)
        • S(e);OGATE,XP(D)::QAB(F),XS(e)
        • S(e);OGATEB,P_SPINS(e),XS(H)::QAR(F)+B(A)
      • Refutation
        • B(a);
  • Actual
    • S(J);N_PINS(e),N_SPINS(H)
    • Threat
      • B(K)+S(H),DCHECK
    • Vars
      • S(b);CHECK,XP(E)::B(K)+S(H),DCHECK,XS(b)
      • R(i);N_GUARD,P_PINS(J),P_SPINR(i),XS(H)::QAR(F),XQ(h)
      • S(e);OGATE,XP(D)::QAB(F),XS(e)
      • S(e);P_SPINS(e),XS(H)::QAR(F)+S(J)
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