MESON Chess Problem Database

Problem Display
PID: 53848 (3q4/6B1/2B1NPQ1/1PP1k2P/2prN2K/8/r3R3/8 w - - 0 1)

Ellerman, Arnoldo

Chess, 1943

3q4/6B1/2B1NPQ1/1PP1k2P/2prN2K/8/r3R3/8

#2

11 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qa5
      • 2.f7#
    • 1...Qb6
      • 2.f7#
    • 1...Qxf6+
      • 2.Qxf6#
    • 1...Qc7
      • 2.f7#
    • 1...Qe7
      • 2.fxe7#
    • 1...Qd5
      • 2.f7#
    • 1...Qd6
      • 2.f7#
    • 1...Qd7
      • 2.f7#
    • 1...Qa8
      • 2.f7#
    • 1...Qb8
      • 2.f7#
    • 1...Qc8
      • 2.f7#
    • 1...Qe8
      • 2.f7#
    • 1...Rd1
      • 2.Sd2#
    • 1...Rd2
      • 2.Sxd2#
    • 1...Rxe4+
      • 2.Rxe4#
      • 2.Qxe4#
    • 1...Rd5
      • 2.Sd2#
    • 1...Rd6
      • 2.Sd2#
    • 1...Rd7
      • 2.Sd2#
  • Tries
    • 1.Kg4?
      • threat
        • 2.Qf5#
      • 1...Rxe4+
        • 2.Rxe4#
        • 2.Qxe4#
      • 1...Kxe6!
    • 1.Kg5?
      • threat
        • 2.Qf5#
      • 1...Qxf6+
        • 2.Qxf6#
      • 1...Kxe6!
  • Keys
    • 1.Bd5!
      • threat
        • 2.Qg5#
      • 1...Rxe4+
        • 2.Qxe4#
      • 1...Kxd5
        • 2.Qf5#
      • 1...Qxd5
        • 2.f7#
      • 1...Rxd5
        • 2.Sd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 15
  • Sets
    • Q(e);N_PINP(I)::B(K)+P(I)
    • Q(e);CHECK,OGATE,P_SPINQ(e),XP(I)::QAB1(J),XQ(e)
    • Q(e);::B(K)+P(I),XQ(e)
    • R(c);N_PINS(B)::R(A)+S(B)
    • R(c);N_PINS(B)::R(A)+S(B),XR(c)
  • Tries
    • Try
      • K(C);N_SPINP(I),P-FLIGHT
      • Threat
        • QAR1(J)
      • Refutation
        • K(d);P-FLIGHT,XS(H)
    • Try
      • K(C);N_SPINS(B),S_FLIGHT
      • Threat
        • QAR1(J)
      • Vars
        • Q(e);CHECK,OGATE,P_SPINQ(e),XP(I)::QAB1(J),XQ(e)
      • Refutation
        • K(d);P-FLIGHT,XS(H)
  • Actual
    • B(G);
    • Threat
      • QAR2(J)
    • Vars
      • R(c);CHECK,OGATE,P_SPINR(c),XS(B)::QAR1(J),XR(c)
      • K(d);P-FLIGHT,XB(G)::QAR2(J)
      • Q(e);N_PINP(I),SBLOCK,XB(G)::B(K)+P(I)
      • R(c);N_PINS(B),SBLOCK,XB(G)::R(A)+S(B)
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