MESON Chess Problem Database

Problem Display
PID: 108477 (R1K1kb1N/2Pn1Rp1/1pr5/2p1p3/B4PQB/7b/8/3r4 w - - 0 1)

Jacobs, Walter William

American Chess Bulletin, 1938

R1K1kb1N/2Pn1Rp1/1pr5/2p1p3/B4PQB/7b/8/3r4

#2

9 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rd6
      • 2.Kb7#
    • 1...Re6
      • 2.Kb7#
    • 1...Rf6
      • 2.Kb7#
    • 1...Rg6
      • 2.Kb7#
    • 1...Rh6
      • 2.Kb7#
    • 1...Rxc7+
      • 2.Kxc7#
  • Tries
    • 1.Bxc6?
      • threat
        • 2.Kb7#
      • 1...Ra1
        • 2.Bxd7#
      • 1...Be7!
    • 1.Qe6+?
      • 1...Rxe6
        • 2.Kb7#
      • 1...Be7
        • 2.Qxe7#
      • 1...Bxe6!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Re7#
      • 1...Rxc7+
        • 2.Kxc7#
      • 1...Sf6+
        • 2.Rd7#
      • 1...Sb8+
        • 2.Rf5#
      • 1...Rxg6
        • 2.Kb7#
      • 1...Rf6
        • 2.Kb7#
      • 1...Bd6
        • 2.Rf5#
      • 1...Be7
        • 2.Rf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • R(f);N_PINP(E),P_SPINS(g)::R(G)+K(H)
    • R(f);CHECK,P_SPINS(g),XP(E)::R(G)+K(H),XR(f)
  • Tries
    • Try
      • B(A);N_SPINP(E),P_PINS(g),XR(f)
      • Threat
        • R(G)+K(H)
      • Vars
        • R(a);N_GUARD::B(A),XS(g)
      • Refutation
        • B(j);
    • Try
      • Q(C);CHECK
      • Vars
        • R(f);N_PINP(E),P_SPINS(g),XQ(C)::R(G)+K(H)
        • B(j);N_GUARD,P_SPINB(j)::QAR1(C),XB(j)
      • Refutation
        • B(b);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAB(C)+R(F),DCHECK
    • Vars
      • R(f);CHECK,P_SPINS(g),XP(E)::R(G)+K(H),XR(f)
      • S(g);CHECK,P_SPINR(f)::QAB(C)+R(F)
      • R(f);N_PINP(E),P_SPINS(g),XQ(C)::R(G)+K(H)
      • R(f);N_PINP(E),P_SPINS(g)::R(G)+K(H)
      • B(j);S_CUTR(f)::QAB(C)+R(F)
      • B(j);SBLOCK::QAB(C)+R(F)
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