MESON Chess Problem Database

Problem Display
PID: 238730 (5r1B/1N5b/1n2Q3/P1Pr2p1/Ppk5/1R3Nb1/1P1p4/3B1n1K w - - 0 1)

Ellerman, Arnoldo

L'Italia Scacchistica, 1954

5r1B/1N5b/1n2Q3/P1Pr2p1/Ppk5/1R3Nb1/1P1p4/3B1n1K

#2

11 + 10

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sh2
      • 2.Sxd2#
    • 1...Se3
      • 2.Sxd2#
    • 1...Sxa4
      • 2.Qa6#
    • 1...Sd7
      • 2.Qa6#
    • 1...Sa8
      • 2.Qa6#
    • 1...Sc8
      • 2.Qa6#
  • Tries
    • 1.Rxb4+?
      • 1...Kd3
        • 2.Qe2#
      • 1...Kxb4!
    • 1.Qe4+?
      • 1...Rd4
        • 2.Qxd4#
      • 1...Bxe4!
    • 1.Qc6?
      • threat
        • 2.Qb5#
      • 1...Rxc5
        • 2.Qxc5#
      • 1...Sxa4
        • 2.Qa6#
      • 1...Rd3
        • 2.cxb6#
      • 1...Rd4
        • 2.cxb6#
      • 1...Re5
        • 2.Sd6#
      • 1...Rdf5
        • 2.Qe4#
      • 1...Rd6
        • 2.cxd6#
      • 1...Rd7
        • 2.cxb6#
      • 1...Rdd8
        • 2.cxb6#
      • 1...Bc2!
  • Keys
    • 1.Rd3!
      • threat
        • 2.Rd4#
      • 1...Kxd3
        • 2.Qe2#
      • 1...Bxd3
        • 2.b3#
      • 1...Sxa4
        • 2.Qa6#
      • 1...Rf4
        • 2.Se5#
      • 1...Bf2
        • 2.Se5#
      • 1...Be5
        • 2.Sxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • S(a);N_GUARD::S(E),XP(b)
    • S(h);OGATE,XP(F)::QAB(I)
    • S(h);OGATE::QAB(I)
  • Tries
    • Try
      • R(D);CHECK,XP(d)
      • Vars
        • K(e);N_SPINR(f),S_FLIGHT::QAB1(I)
      • Refutation
        • K(e);N_SPINR(f),P-FLIGHT,XR(D)
    • Try
      • Q(I);CHECK,N_PINR(f)
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAR1(I),XR(f)
      • Refutation
        • B(i);P_PINS(E),XQ(I)
    • Try
      • Q(I);N_PINR(f)
      • Threat
        • QAB1(I)
      • Vars
        • R(f);OGATE,P_SPINR(f),XP(H)::QAR1(I),XR(f)
        • S(h);OGATE,XP(F)::QAB(I)
        • R(f);N_GUARD::QAR(I)+P(H),XS(h)
        • R(f);N_GUARD,S_CUTB(c)::S(J)
        • R(f);OGATE::QAR2(I)
        • R(f);OGATE::QAR(I)+P(H),XR(f)
      • Refutation
        • B(i);
  • Actual
    • R(D);
    • Threat
      • R1(D)
    • Vars
      • K(e);N_SPINR(f),OGATEB,S_FLIGHT,XR(D)::QAB1(I)
      • B(i);SBLOCK,XR(D)::P(C)
      • S(h);OGATE,XP(F)::QAB(I)
      • R(j);S_CUTB(c)::S(E)
      • B(c);N_GUARD::S(E)
      • B(c);N_GUARD::S(E),XB(c)
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