MESON Chess Problem Database

Problem Display
PID: 204324 (4R3/r2q3B/pBP1N1R1/6P1/4k1K1/2p5/Q3p3/2N5 w - - 0 1)

Ellerman, Arnoldo

L'Alfiere di Re, 1925

4R3/r2q3B/pBP1N1R1/6P1/4k1K1/2p5/Q3p3/2N5

#2

10 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe6+
      • 2.Rgxe6#
      • 2.Rexe6#
      • 2.Qxe6#
    • 1...Qd1
      • 2.Sc7#
    • 1...Qd2
      • 2.Sc7#
    • 1...Qd3
      • 2.Sc7#
    • 1...Qd4
      • 2.Sc5#
    • 1...Qd5
      • 2.Qxe2#
    • 1...Qb7
      • 2.Sc7#
    • 1...Qc7
      • 2.Sxc7#
  • Tries
    • 1.Qc4+?
      • 1...Qd4
        • 2.Sc5#
        • 2.Sc7#
        • 2.Qxd4#
      • 1...Ke5!
    • 1.cxd7?
      • threat
        • 2.Sd4#
        • 2.Sf4#
        • 2.Sc7#
        • 2.Sg7#
        • 2.Sd8#
        • 2.Sf8#
      • 1...Ke5
        • 2.Sd4#
        • 2.Sf4#
        • 2.Sc7#
        • 2.Sg7#
        • 2.Sd8#
        • 2.Sf8#
      • 1...Rc7
        • 2.Sd4#
        • 2.Sf4#
        • 2.Sxc7#
        • 2.Sg7#
        • 2.Sd8#
        • 2.Sf8#
      • 1...Ra8
        • 2.Sd8#
      • 1...Rxd7!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Rg7#
      • 1...Qxe6+
        • 2.Rgxe6#
      • 1...Kxd3
        • 2.Rg7#
      • 1...Qxe8
        • 2.Qc4#
      • 1...Qxd3
        • 2.Sc7#
      • 1...Qxh7
        • 2.Qc4#
      • 1...Qd4
        • 2.Sec5#
      • 1...Qd5
        • 2.Qxe2#
      • 1...Qf7
        • 2.Qc4#
      • 1...Qg7
        • 2.Rxg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 4
  • Sets
    • Q(f);N_PINS(G)::R(J)+S(G)
    • Q(f);N_PINS(G),SBLOCK::R(J)+S(G),DCHECK
    • Q(f);N_PINS(G),SBLOCK::QAR2(B),XP(a)
    • Q(f);N_PINS(G)::R(J)+S(G),XQ(f)
  • Tries
    • Try
      • Q(B);CHECK
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • P(F);N_SPINS(G),XQ(f)
      • Threat
        • DUALS(6)
      • Vars
        • R(e);::R(J)+S(G)
      • Refutation
        • R(e);XP(F)
  • Actual
    • S(A);
    • Threat
      • B(I)+R(H)
    • Vars
      • Q(f);CHECK,OGATE,P_SPINQ(f),XS(G)::B(I)+R(H),DCHECK,XQ(f)
      • K(c);S_FLIGHT,XS(A)::B(I)+R(H)
      • Q(f);N_GUARD,N_PINS(G),XR(J)::QAR2(B)
      • Q(f);N_PINS(G),SBLOCK,XS(A)::R(J)+S(G)
      • Q(f);N_GUARD,N_PINS(G),XB(I)::QAR2(B)
      • Q(f);N_PINS(G),SBLOCK::R(J)+S(G),DCHECK
      • Q(f);N_PINS(G),SBLOCK::QAR2(B),XP(a)
      • Q(f);N_GUARD,N_PINS(G)::QAR2(B)
      • Q(f);N_PINS(G)::B(I)+R(H),XQ(f)
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