MESON Chess Problem Database

Problem Display
PID: 173212 (2B1QnK1/3p1p2/R4p2/Pk3rp1/p3N3/1bbP4/n1N5/1R2B3 w - - 0 1)

Shanahan, Ian

1st HM., Problem Observer, 1995

2B1QnK1/3p1p2/R4p2/Pk3rp1/p3N3/1bbP4/n1N5/1R2B3

#2

10 + 11

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.Sd6#
    • 1...Ba1
      • 2.Sa3#
      • 2.Rb6#
    • 1...Bb2
      • 2.Rb6#
    • 1...Bb4
      • 2.Sd4#
    • 1...Bd4
      • 2.Sa3#
      • 2.Sxd4#
    • 1...Bxa5
      • 2.Sa3#
      • 2.Sd4#
    • 1...Be5
      • 2.Sa3#
      • 2.Rb6#
    • 1...Sb4
      • 2.Sa3#
    • 1...Se6
      • 2.Qxd7#
    • 1...Sg6
      • 2.Qxd7#
    • 1...Sh7
      • 2.Qxd7#
  • Tries
    • 1.Sxc3+?
      • 1...Kc5
        • 2.Qe3#
      • 1...Sxc3!
    • 1.Bxd7+?
      • 1...Kxa6
        • 2.Qa8#
      • 1...Sxd7!
    • 1.Rxb3+?
      • 1...Bb4
        • 2.Sa3#
        • 2.Sd4#
      • 1...Sb4
        • 2.Sa3#
      • 1...axb3!
    • 1.Qe7?
      • threat
        • 2.Sa3#
      • 1...Rc5
        • 2.Sd6#
        • 2.Qxc5#
      • 1...Bb2
        • 2.Rb6#
      • 1...Bb4
        • 2.Sd4#
      • 1...d6
        • 2.Qb7#
      • 1...a3!
    • 1.Qd8?
      • threat
        • 2.Qb6#
      • 1...Bxa5
        • 2.Sa3#
        • 2.Sd4#
        • 2.Qxa5#
      • 1...Bd4
        • 2.Sa3#
        • 2.Sxd4#
      • 1...a3!
    • 1.Qxf8?
      • threat
        • 2.Sa3#
      • 1...Rc5
        • 2.Sd6#
        • 2.Qxc5#
      • 1...Bb2
        • 2.Rb6#
      • 1...Bb4
        • 2.Sd4#
      • 1...d6
        • 2.Qe8#
      • 1...a3!
  • Keys
    • 1.Qxf7!
      • threat
        • 2.Qc4#
      • 1...Rc5
        • 2.Sd6#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Bb2
        • 2.Rb6#
      • 1...Bb4
        • 2.Sd4#
      • 1...Sb4
        • 2.Sa3#
      • 1...Se6
        • 2.Qxd7#
      • 1...d5
        • 2.Qb7#

This is a version of 1166

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(f);SBLOCK::S(E)
    • B(c);N_SPINB(b)::R1(G)
    • B(c);N_GUARD,N_SPINB(b)::S(C)
    • S(a);N_SPINB(b),SBLOCK::S(C)
    • S(k);N_GUARD::QAB(I),XP(i)
  • Tries
    • Try
      • S(E);CHECK,XB(c)
      • Vars
        • K(e);N_SPINB(b),N_SPINP(i),P-FLIGHT::QAB(I)
      • Refutation
        • S(a);XS(E)
    • Try
      • B(H);CHECK,XP(i)
      • Vars
        • K(e);N_SPINB(b),S_FLIGHT,XR(G)::QAR2(I)
      • Refutation
        • S(k);P_SPINS(k),XB(H)
    • Try
      • R(A);CHECK,XB(b)
      • Vars
        • S(a);P_SPINS(a)::S(C)
      • Refutation
        • P(d);XR(A)
    • Try
      • Q(I);N_PINP(i)
      • Threat
        • S(C)
      • Vars
        • B(c);N_SPINB(b)::R1(G)
        • B(c);N_GUARD,N_SPINB(b)::S(C)
        • P(i);OGATE::QAR2(I)
      • Refutation
        • P(d);
    • Try
      • Q(I);N_PINP(i)
      • Threat
        • QAR1(I)
      • Refutation
        • P(d);
    • Try
      • Q(I);N_PINP(i),XS(k)
      • Threat
        • S(C)
      • Vars
        • B(c);N_SPINB(b)::R1(G)
        • B(c);N_GUARD,N_SPINB(b)::S(C)
        • P(i);OGATEB::QAB(I)
      • Refutation
        • P(d);
  • Actual
    • Q(I);N_PINP(i),P_SPINQ(I),XP(j)
    • Threat
      • QAB1(I)
    • Vars
      • R(f);SBLOCK::S(E)
      • R(f);N_GUARD,N_PINQ(I)::QAR2(I),XR(f)
      • B(c);N_SPINB(b)::R1(G)
      • B(c);N_GUARD,N_SPINB(b)::S(C)
      • S(a);N_SPINB(b),SBLOCK::S(C)
      • S(k);N_PINQ(I)::QAB(I),XP(i)
      • P(i);N_PINQ(I)::QAR2(I)
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