MESON Chess Problem Database

Problem Display
PID: 278231 (2R5/8/8/1p1pB3/3PkPK1/1p4Pp/1PNrPrN1/qQ2R2B w - - 0 1)

Hjelle, David

Stella Polaris, 1972

2R5/8/8/1p1pB3/3PkPK1/1p4Pp/1PNrPrN1/qQ2R2B

#2

13 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rdxe2
      • 2.Sxa1#
    • 1...Rxf4+
      • 2.Sxf4#
  • Tries
    • 1.Sxa1+?
      • 1...Rd3
        • 2.Qxd3#
        • 2.exd3#
      • 1...Rc2!
    • 1.Sge3+?
      • 1...Rf3
        • 2.Bxf3#
      • 1...Rg2!
    • 1.Sh4+?
      • 1...Rf3
        • 2.Bxf3#
      • 1...Rg2!
    • 1.Re8?
      • threat
        • 2.Bd6#
        • 2.Bf6#
        • 2.Bc7#
        • 2.Bg7#
        • 2.Bb8#
        • 2.Bh8#
      • 1...Rxf4+
        • 2.Sxf4#
        • 2.Bxf4#
      • 1...Rxc2
        • 2.Bf6#
        • 2.Bg7#
        • 2.Bh8#
      • 1...Rdxe2
        • 2.Sxa1#
      • 1...bxc2
        • 2.Bf6#
        • 2.Bg7#
        • 2.Bh8#
      • 1...Qa3
        • 2.Bd6#
      • 1...Qa6
        • 2.Bd6#
      • 1...Qa7
        • 2.Bc7#
      • 1...Qa8
        • 2.Bb8#
      • 1...Rfxe2!
  • Keys
    • 1.Rc3!
      • threat
        • 2.Re3#
      • 1...Rxf4+
        • 2.Sxf4#
      • 1...Rdxe2
        • 2.Sxa1#
      • 1...Rfxe2
        • 2.Sh4#
      • 1...Rd3
        • 2.exd3#
      • 1...Rf3
        • 2.exf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(b);N_GUARD,P_SPINR(b),XP(F)::QAB(A)+S(E),XQ(a)
    • R(c);CHECK,XP(J)::B(C)+S(G),XR(c)
  • Tries
    • Try
      • S(E);CHECK,XQ(a)
      • Refutation
        • R(b);P_SPINR(b)
    • Try
      • S(G);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::B(C),XR(c)
      • Refutation
        • R(c);P_PINP(H),P_SPINR(c)
    • Try
      • S(G);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::B(C),XR(c)
      • Refutation
        • R(c);P_PINP(H),P_SPINR(c)
    • Try
      • R(M);
      • Threat
        • DUALS(6)
      • Vars
        • R(b);N_GUARD,P_SPINR(b),XP(F)::QAB(A)+S(E),XQ(a)
        • Q(a);::R(M)+B(L)
      • Refutation
        • R(c);P_SPINR(c),XP(F)
  • Actual
    • R(M);
    • Threat
      • R1(M)
    • Vars
      • R(c);CHECK,XP(J)::B(C)+S(G),XR(c)
      • R(b);N_GUARD,P_SPINR(b),XP(F)::QAB(A)+S(E),XQ(a)
      • R(c);N_GUARD,P_SPINR(c),XP(F)::B(C)+S(G)
      • R(b);OGATE::R(B)+P(F)DCHECK,XR(b)
      • R(c);OGATE::R(B)+P(F)DCHECK,XR(c)
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