MESON Chess Problem Database

Problem Display
PID: 238709 (8/4n1B1/rb6/n3N1q1/3k2BR/4NP2/3P2K1/2R3Q1 w - - 0 1)

Ellerman, Arnoldo

L'Italia Scacchistica, 1927

8/4n1B1/rb6/n3N1q1/3k2BR/4NP2/3P2K1/2R3Q1

#2

10 + 6

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe3
      • 2.Be6#
    • 1...Qxg4+
      • 2.Rxg4#
    • 1...Qxe5
      • 2.Bf5#
    • 1...Qf5
      • 2.Bxf5#
    • 1...Qh5
      • 2.Bxh5#
    • 1...Sb3
      • 2.Rc4#
    • 1...Sc4
      • 2.Rxc4#
    • 1...Sac6
      • 2.Rc4#
    • 1...Sb7
      • 2.Rc4#
    • 1...Sd5
      • 2.Sc2#
      • 2.Sf5#
  • Tries
    • 1.Sd1+?
      • 1...Qe3
        • 2.Be6#
      • 1...Kd5!
    • 1.Sf1+?
      • 1...Qe3
        • 2.Be6#
      • 1...Kd5!
    • 1.Sd5+?
      • 1...Qe3
        • 2.Be6#
      • 1...Kxd5!
    • 1.Sg6+?
      • 1...Qf6
        • 2.Bf5#
      • 1...Qe5
        • 2.Bf5#
      • 1...Kd3!
  • Keys
    • 1.Rc2!
      • threat
        • 2.Qa1#
      • 1...Qxg4+
        • 2.Rxg4#
      • 1...Qxe3
        • 2.Be6#
      • 1...Qxe5
        • 2.Bf5#
      • 1...Sc4
        • 2.Rxc4#
      • 1...Sb3
        • 2.Rc4#
      • 1...Sac6
        • 2.Rc4#
      • 1...Sb7
        • 2.Rc4#
      • 1...Sd5
        • 2.Sf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • Q(c);N_PINB(G),P_SPINQ(c),XS(E)::R(H)+B(G)
    • Q(c);CHECK,OGATE,P_SPINQ(c),XB(G)::R(H),XQ(c)
    • Q(c);N_PINB(G),P_SPINQ(c),XS(I)::R(H)+B(G)
    • Q(c);N_PINB(G)::R(H)+B(G),XQ(c)
    • S(b);N_GUARD::R1(A)
    • S(b);N_GUARD::R1(A),XS(b)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • Q(c);N_PINB(G),P_SPINQ(c)::R(H)+B(G)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(E);CHECK
      • Vars
        • Q(c);N_PINB(G),P_SPINQ(c)::R(H)+B(G)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(E);CHECK
      • Vars
        • Q(c);N_PINB(G),P_SPINQ(c)::R(H)+B(G)
      • Refutation
        • K(a);P-FLIGHT,XS(E)
    • Try
      • S(I);CHECK
      • Vars
        • Q(c);N_PINB(G),P_SPINQ(c)::R(H)+B(G)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • R(A);
    • Threat
      • QAB(B)
    • Vars
      • Q(c);CHECK,OGATE,P_SPINQ(c),XB(G)::R(H),XQ(c)
      • Q(c);N_PINB(G),P_SPINQ(c),XS(E)::R(H)+B(G)
      • Q(c);N_PINB(G),P_SPINQ(c),XS(I)::R(H)+B(G)
      • S(b);N_GUARD::R1(A),XS(b)
      • S(b);N_GUARD::R1(A)
      • S(f);SBLOCK::QAB(B)+S(E),DCHECK
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