MESON Chess Problem Database

Problem Display
PID: 218841 (1b6/3K3p/N2p1P2/P1pkN3/2RP4/5P2/2rQ3r/1B6 w - - 0 1)

Parrinello, Mario

The Problemist, 1987

1b6/3K3p/N2p1P2/P1pkN3/2RP4/5P2/2rQ3r/1B6

#2

10 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rc1
      • 2.Be4#
    • 1...Ra2
      • 2.Be4#
    • 1...Rb2
      • 2.Be4#
    • 1...Rcxd2
      • 2.Be4#
    • 1...Rc3
      • 2.Be4#
    • 1...Rxc4
      • 2.Be4#
    • 1...Ba7
      • 2.Sc7#
    • 1...Bc7
      • 2.Sxc7#
    • 1...cxd4
      • 2.Qxd4#
  • Tries
    • 1.Rxc5+?
      • 1...Rxc5
        • 2.Sb4#
        • 2.Be4#
      • 1...dxc5!
    • 1.Qg5?
      • threat
        • 2.Qg8#
      • 1...Rxc4
        • 2.Sc6#
      • 1...cxd4
        • 2.Sb4#
      • 1...Rcg2
        • 2.Be4#
      • 1...Rhg2!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Qb7#
      • 1...Rxc4
        • 2.Qxc4#
      • 1...cxb4
        • 2.Sxb4#
      • 1...cxd4
        • 2.Qb5#
      • 1...dxe5
        • 2.Qxc5#
      • 1...Rb2
        • 2.Be4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • R(a);OGATE::B(A)
    • R(a);OGATE,XQ(B)::B(A)
    • R(a);OGATE,XR(D)::B(A)
    • B(g);N_GUARD::S(H)
    • B(g);N_GUARD::S(H),XB(g)
    • P(c);OGATE,P_SPINP(c),XP(E)::QAR1(B),XP(c)
  • Tries
    • Try
      • R(D);CHECK,XP(c)
      • Refutation
        • P(e);XR(D)
    • Try
      • Q(B);
      • Threat
        • QAB(B)
      • Vars
        • R(a);SBLOCK,XR(D)::QAR(B)+S(G)
        • P(c);N_GUARD,XP(E)::S(H)
        • R(a);OGATE::B(A)
      • Refutation
        • R(b);
  • Actual
    • Q(B);
    • Threat
      • QAB(B)
    • Vars
      • R(a);OGATE,XR(D)::QAB1(B),XR(a)
      • P(c);XQ(B)::S(H),XP(c)
      • P(c);OGATEB,XP(E)::QAR2(B)
      • P(e);N_GUARD,XS(G)::QAR1(B),XP(c)
      • R(a);OGATE::B(A)
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