MESON Chess Problem Database

Problem Display
PID: 238731 (4N3/7n/1K1p2pB/8/2Prk1p1/3Nr2n/1Q4P1/1B3R2 w - - 0 1)

Ellerman, Arnoldo

L'Italia Scacchistica, 1958

4N3/7n/1K1p2pB/8/2Prk1p1/3Nr2n/1Q4P1/1B3R2

#2

9 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Re2
      • 2.Qxe2#
    • 1...Rexd3
      • 2.Qe2#
    • 1...Rdxd3
      • 2.Sxd6#
    • 1...Rd5
      • 2.Sf2#
      • 2.Sc5#
    • 1...Sg1
      • 2.Rf4#
    • 1...Sf4
      • 2.Rxf4#
    • 1...S3g5
      • 2.Rf4#
    • 1...S7g5
      • 2.Sf6#
    • 1...Sf6
      • 2.Sxf6#
    • 1...Sf8
      • 2.Sf6#
    • 1...d5
      • 2.Sd6#
  • Tries
    • 1.Sc1+?
      • 1...Red3
        • 2.Qe2#
      • 1...Rdd3
        • 2.Sxd6#
      • 1...Ke5!
    • 1.Se1+?
      • 1...Red3
        • 2.Qe2#
      • 1...Rdd3
        • 2.Sxd6#
      • 1...Ke5!
    • 1.Sb4+?
      • 1...Red3
        • 2.Qe2#
      • 1...Rdd3
        • 2.Sxd6#
      • 1...Ke5!
    • 1.Se5+?
      • 1...Red3
        • 2.Qe2#
      • 1...Rdd3
        • 2.Sxd6#
      • 1...Kxe5!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Sf2#
      • 1...Rexd3
        • 2.Re1#
      • 1...Rdxd3
        • 2.Qd5#
      • 1...Rxc4
        • 2.Qxc4#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Sf2
        • 2.Sxf2#
      • 1...S3g5
        • 2.Rf4#
      • 1...S7g5
        • 2.Sf6#
      • 1...d5
        • 2.Sd6#
      • 1...g5
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • R(a);OGATEB::QAR2(C),XR(a)
    • R(a);OGATEB,P_SPINR(a),XS(E)::QAR2(C)
    • R(c);N_GUARD,P_SPINR(c),XS(E)::S(I),XP(f)
    • S(b);N_GUARD::R1(B)
    • S(b);N_GUARD::R1(B),XS(b)
    • S(h);N_GUARD::S(I)
    • S(h);N_GUARD::S(I),XS(h)
    • P(f);S_CUTR(c)::S(I)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • R(a);P_SPINR(a),S_CUTR(c)::QAR2(C)
        • R(c);P_SPINR(c)::S(I),XP(f)
      • Refutation
        • K(d);P-FLIGHT,P_SPINR(c)
    • Try
      • S(E);CHECK
      • Vars
        • R(a);P_SPINR(a),S_CUTR(c)::QAR2(C)
        • R(c);P_SPINR(c)::S(I),XP(f)
      • Refutation
        • K(d);P-FLIGHT,P_SPINR(c)
    • Try
      • S(E);CHECK
      • Vars
        • R(a);P_SPINR(a),S_CUTR(c)::QAR2(C)
        • R(c);P_SPINR(c)::S(I),XP(f)
      • Refutation
        • K(d);P-FLIGHT,P_SPINR(c)
    • Try
      • S(E);CHECK
      • Vars
        • R(a);P_SPINR(a),S_CUTR(c)::QAR2(C)
        • R(c);P_SPINR(c)::S(I),XP(f)
      • Refutation
        • K(d);P-FLIGHT,P_SPINR(c),XS(E)
  • Actual
    • Q(C);
    • Threat
      • B(A)+S(E),DCHECK
    • Vars
      • R(a);OGATEB,P_SPINR(a),XS(E)::R(B)
      • R(c);N_GUARD,P_SPINR(c),XS(E)::QAB1(C)
      • R(c);OGATE,XP(F)::QAR2(C),XR(c)
      • R(c);N_GUARD::QAB1(C),XR(c)
      • S(b);::B(A)+S(E),DCHECK,XS(b)
      • S(b);N_GUARD::R1(B)
      • S(h);N_GUARD::S(I)
      • P(f);S_CUTR(c)::S(I)
      • P(g);N_GUARD::QAB1(C)
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