MESON Chess Problem Database

Problem Display
PID: 83674 (q2N1B1K/3P3p/8/2n1r3/1PpkP1Q1/2R1N3/1Pp1R2p/2r5 w - - 0 1)

Ellerman, Arnoldo

Problemas, 1961

q2N1B1K/3P3p/8/2n1r3/1PpkP1Q1/2R1N3/1Pp1R2p/2r5

#2

11 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4
      • 2.Sc6#
    • 1...Qc6
      • 2.Sxc6#
    • 1...Qa1
      • 2.Sc6#
    • 1...Qa2
      • 2.Sc6#
    • 1...Qa3
      • 2.Sc6#
    • 1...Qa5
      • 2.Sc6#
    • 1...Qa7
      • 2.Sc6#
    • 1...Qb8
      • 2.Sc6#
    • 1...Ra1
      • 2.Sxc2#
    • 1...Rb1
      • 2.Sxc2#
    • 1...Rd1
      • 2.Sxc2#
    • 1...Re1
      • 2.Sxc2#
    • 1...Rf1
      • 2.Sxc2#
    • 1...Rg1
      • 2.Sxc2#
    • 1...Rh1
      • 2.Sxc2#
    • 1...Rxe4
      • 2.Bg7#
    • 1...Sd3
      • 2.Rxc4#
    • 1...Sa4
      • 2.Rd2#
    • 1...Sxe4
      • 2.Rd2#
    • 1...Sa6
      • 2.Rd2#
    • 1...Se6
      • 2.Rd2#
    • 1...Sb7
      • 2.Sc6#
      • 2.Rd2#
    • 1...Sxd7
      • 2.Rd2#
  • Tries
    • 1.Se6+?
      • 1...Sxe6
        • 2.Rd2#
      • 1...Rxe6!
    • 1.Bg7?
      • threat
        • 2.Sf5#
      • 1...Qxe4
        • 2.Sc6#
      • 1...Sxe4
        • 2.Rd2#
      • 1...Rf1
        • 2.Sxc2#
      • 1...Qxd8+!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Sf5#
      • 1...Kxe4
        • 2.Qg4#
      • 1...Qxe4
        • 2.Bxc5#
      • 1...Sxe4
        • 2.Se6#
      • 1...Rf1
        • 2.Sxc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 19
  • Sets
    • Q(i);N_GUARD,P_SPINQ(i),XP(F)::S(I)
    • Q(i);N_GUARD::S(I),XQ(i)
    • Q(i);N_GUARD::S(I)
    • R(a);N_GUARD::S(D),XP(b)
    • R(g);OGATEB,P_SPINR(g),XP(F)::B(J)
    • S(f);SBLOCK::R1(C),XP(d)
    • S(f);N_GUARD::R(B)
    • S(f);N_GUARD,P_SPINS(f),XP(F)::R(B)
    • S(f);N_GUARD,XP(H)::R(B)
  • Tries
    • Try
      • S(I);CHECK,P_SPINB(J)
      • Vars
        • S(f);XS(I)::R(B)
      • Refutation
        • R(g);XS(I)
    • Try
      • B(J);P_PINR(g),P_SPINS(I)
      • Threat
        • S(D)
      • Vars
        • Q(i);N_PINS(I),P_SPINQ(i),XP(F)::S(I)
        • S(f);N_GUARD,P_SPINS(f),XP(F)::R(B)
        • R(a);N_GUARD::S(D),XP(b)
      • Refutation
        • Q(i);CHECK,XS(I)
  • Actual
    • Q(G);P_PINR(g)
    • Threat
      • S(D)
    • Vars
      • K(e);N_SPINR(g),OGATEB,P-FLIGHT,XP(F)::QAR2(G)
      • Q(i);SBLOCK,XP(F)::B(J),XS(f)
      • S(f);N_GUARD,SBLOCK,XP(F)::S(I)
      • R(a);N_GUARD::S(D),XP(b)
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