MESON Chess Problem Database

Problem Display
PID: 196767 (2N4R/PPpk1B2/2n2p2/1r2p3/Q3N1n1/6pK/1r3b2/8 w - - 0 1)

Thomson, Robert Gavin

L'Eco degli Scacchi, 1919

2N4R/PPpk1B2/2n2p2/1r2p3/Q3N1n1/6pK/1r3b2/8

#2

8 + 10

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sh2
      • 2.Sxf6#
    • 1...Se3
      • 2.Sxf6#
    • 1...Sh6
      • 2.Sxf6#
    • 1...Sb4
      • 2.b8S#
    • 1...Sd4
      • 2.b8S#
    • 1...Sa5
      • 2.b8S#
    • 1...Sxa7
      • 2.b8S#
    • 1...Se7
      • 2.b8S#
    • 1...Sb8
      • 2.axb8S#
  • Tries
    • 1.Be8+?
      • 1...Kd8
        • 2.Bxc6#
      • 1...Ke6!
    • 1.Qxb5?
      • threat
        • 2.Qd5#
        • 2.b8S#
      • 1...Bxa7
        • 2.Qd5#
      • 1...Rd2
        • 2.b8S#
      • 1...Bc5
        • 2.Sxc5#
        • 2.b8S#
      • 1...Se3
        • 2.Sc5#
        • 2.Sxf6#
        • 2.b8S#
      • 1...Rxb5!
    • 1.Qc4?
      • threat
        • 2.Be6#
        • 2.Qe6#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Sd8
        • 2.Be8#
      • 1...Sd4!
    • 1.b8S+?
      • 1...Sxb8
        • 2.axb8S#
      • 1...Rxb8!
  • Keys
    • 1.Sg5!
      • threat
        • 2.Be6#
      • 1...Sxa7
        • 2.b8S#
      • 1...fxg5
        • 2.Qxg4#
      • 1...Sb4
        • 2.b8S#
      • 1...Sd4
        • 2.b8S#
      • 1...Sa5
        • 2.b8S#
      • 1...Se7
        • 2.b8S#
      • 1...Sb8
        • 2.axb8S#
      • 1...Sd8
        • 2.Be8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • S(d);N_GUARD::S(C),XP(h)
    • S(g);N_GUARD,P_SPINR(e)::P=S
    • S(g);N_GUARD,P_SPINR(e),XP(D)::P=S
    • S(g);OGATE,P_SPINR(e)::PXS(g)=S
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • K(j);OGATE,P-FLIGHT::R(H)+B(F),XS(g)
      • Refutation
        • K(j);S_FLIGHT
    • Try
      • Q(B);P_PINS(g),XR(e)
      • Threat
        • DUALS(2)
      • Vars
        • B(b);XP(D)::QAR2(B)
        • R(a);::P=S
      • Refutation
        • R(a);N_SPINS(g),XQ(B)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(e);N_GUARD::QAR2(B),XR(e)
        • S(g);SBLOCK::B(F)
      • Refutation
        • S(g);
    • Try
      • P(E);CHECK
      • Vars
        • S(g);OGATE,P_SPINR(e),XS(E)::PXS(g)=S
      • Refutation
        • R(e);P_SPINS(g),XS(E)
  • Actual
    • S(C);
    • Threat
      • B(F)
    • Vars
      • S(g);N_GUARD,P_SPINR(e),XP(D)::P=S
      • P(h);N_GUARD,XS(C)::QAB(B),XS(d)
      • S(g);N_GUARD,P_SPINR(e)::P=S
      • S(g);OGATE,P_SPINR(e)::PXS(g)=S
      • S(g);P_SPINR(e),SBLOCK::B(F)
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