MESON Chess Problem Database

Problem Display
PID: 261952 (2r5/5B2/Q3N3/4P1p1/P1PpP1N1/2pkp2R/1P3n1p/2R1K1bq w - - 0 1)

Ellerman, Arnoldo

Problemnoter, 1961

2r5/5B2/Q3N3/4P1p1/P1PpP1N1/2pkp2R/1P3n1p/2R1K1bq

#2

12 + 10

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe4
      • 2.Bg6#
    • 1...Qxe4
      • 2.c5#
    • 1...Rxc4
      • 2.Sc5#
    • 1...Rc5
      • 2.Sxc5#
    • 1...Ra8
      • 2.Sc5#
    • 1...Rb8
      • 2.Sc5#
    • 1...Rd8
      • 2.Sc5#
    • 1...Re8
      • 2.Sc5#
    • 1...Rf8
      • 2.Sc5#
    • 1...Rg8
      • 2.Sc5#
    • 1...Rh8
      • 2.Sc5#
    • 1...Sxe4
      • 2.c5#
  • Tries
    • 1.Sf6?
      • threat
        • 2.c5#
      • 1...Rxc4
        • 2.Sc5#
      • 1...Rc5
        • 2.Sxc5#
      • 1...Ra8
        • 2.Sc5#
      • 1...Rb8
        • 2.Sc5#
      • 1...Rc6!
    • 1.Bg6?
      • threat
        • 2.c5#
      • 1...Rxc4
        • 2.Sc5#
      • 1...Rc5
        • 2.Sxc5#
      • 1...Ra8
        • 2.Sc5#
      • 1...Rb8
        • 2.Sc5#
      • 1...Rc6!
    • 1.Rxc3+?
      • 1...Kxe4
        • 2.Bg6#
      • 1...dxc3!
    • 1.Qxc8?
      • threat
        • 2.Sc5#
      • 1...Kxe4
        • 2.Bg6#
      • 1...Sxe4!
  • Keys
    • 1.Qd6!
      • threat
        • 2.Qxd4#
      • 1...Kxc4
        • 2.Sf4#
      • 1...Kxe4
        • 2.Bg6#
      • 1...Qxe4
        • 2.Rxc3#
      • 1...Rxc4
        • 2.Rxe3#
      • 1...Rd8
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • K(f);N_SPINP(g),OGATEB,S_FLIGHT,XP(G)::B(L)
    • Q(b);SBLOCK,XP(G)::QAB(J)+P(F)
    • R(j);N_GUARD,P_SPINR(j),XP(F)::S(K)
    • R(j);N_GUARD::S(K),XR(j)
    • R(j);N_GUARD::S(K)
    • S(c);SBLOCK,XP(G)::QAB(J)+P(F)
  • Tries
    • Try
      • S(H);
      • Threat
        • QAB(J)+P(F)
      • Vars
        • R(j);N_GUARD,P_SPINR(j),XP(F)::S(K)
        • R(j);N_GUARD::S(K),XR(j)
        • R(j);N_GUARD::S(K)
      • Refutation
        • R(j);
    • Try
      • B(L);
      • Threat
        • QAB(J)+P(F)
      • Vars
        • R(j);N_GUARD,P_SPINR(j),XP(F)::S(K)
        • R(j);N_GUARD::S(K),XR(j)
        • R(j);N_GUARD::S(K)
      • Refutation
        • R(j);
    • Try
      • R(A);CHECK,XP(e)
      • Vars
        • K(f);N_SPINP(g),S_CUTP(h),S_FLIGHT,XP(G)::B(L)
      • Refutation
        • P(h);XR(A)
    • Try
      • Q(J);XR(j)
      • Threat
        • S(K)
      • Vars
        • K(f);N_SPINP(g),OGATEB,S_FLIGHT,XP(G)::B(L)
      • Refutation
        • S(c);XP(G)
  • Actual
    • Q(J);
    • Threat
      • QAR1(J),XP(h)
    • Vars
      • K(f);N_GUARD,N_SPINP(g),P_SPINP(e),S_CUTP(i),S_FLIGHT,XP(F)::B(L)+S(K)
      • K(f);N_SPINP(g),OGATEB,S_FLIGHT,XP(G)::B(L)
      • Q(b);SBLOCK,XP(G)::R1(A),XP(e)
      • R(j);SBLOCK,XP(F)::R1(D),XP(g)
      • R(j);N_GUARD::S(K)
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