MESON Chess Problem Database

Problem Display
PID: 64476 (1Bb5/pr2NnK1/3b1Np1/3R2r1/2n1PkBP/2PP1P2/qp1pQ3/6R1 w - - 0 1)

Ellerman, Arnoldo

3rd Prize, Chess, 1947

1Bb5/pr2NnK1/3b1Np1/3R2r1/2n1PkBP/2PP1P2/qp1pQ3/6R1

#2

13 + 12

81 Chess 1949

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd5
      • 2.Sxg6#
    • 1...Re5
      • 2.Sxg6#
    • 1...Rf5
      • 2.Sxg6#
    • 1...Rh5
      • 2.Sxg6#
    • 1...Sa3
      • 2.Qxd2#
    • 1...Se3
      • 2.Qh2#
    • 1...Sa5
      • 2.Qxd2#
    • 1...Sce5
      • 2.Qxd2#
    • 1...Sb6
      • 2.Qxd2#
  • Tries
    • 1.Sh5+?
      • 1...Rxh5
        • 2.Sxg6#
      • 1...gxh5+!
    • 1.Qxd2+?
      • 1...Se3
        • 2.Qh2#
      • 1...Sxd2!
    • 1.e5?
      • threat
        • 2.Rd4#
        • 2.Qe4#
      • 1...Rxe5
        • 2.Sxg6#
      • 1...Bc5
        • 2.Qe4#
      • 1...Se3
        • 2.Qh2#
      • 1...Bf5!
  • Keys
    • 1.Rd4!
      • threat
        • 2.e5#
      • 1...Ke5
        • 2.Qh2#
      • 1...Rd5
        • 2.Sxg6#
        • 2.exd5#
      • 1...Re5
        • 2.Sxg6#
      • 1...Be5
        • 2.Sd5#
      • 1...Bf5
        • 2.exf5#
      • 1...Se3
        • 2.Qh2#
      • 1...Sce5
        • 2.Qxd2#
      • 1...Sfe5
        • 2.Sd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • R(f);N_GUARD,XR(I)::S(K),XP(h)
    • R(f);N_GUARD,N_SPINB(g)::S(K),XP(h)
    • R(f);N_GUARD::S(K),XP(h)
    • S(d);N_GUARD::QAB(B),XP(c)
    • S(d);SBLOCK::QAB(B)
    • S(d);N_GUARD,N_SPINB(g)::QAB(B),XP(c)
  • Tries
    • Try
      • S(J);CHECK
      • Vars
        • R(f);XS(J)::S(K),XP(h)
      • Refutation
        • P(h);CHECK,XS(J)
    • Try
      • Q(B);CHECK,XP(c)
      • Vars
        • S(d);P_SPINS(d),SBLOCK::QAB(B)
      • Refutation
        • S(d);XQ(B)
    • Try
      • P(F);N_PINB(g)
      • Threat
        • DUALS(2)
      • Vars
        • R(f);N_GUARD,XP(F)::S(K),XP(h)
        • B(g);::QAR1(B)
        • S(d);SBLOCK::QAB(B)
      • Refutation
        • B(l);
  • Actual
    • R(I);
    • Threat
      • R(I)+P(F)
    • Vars
      • K(e);S_FLIGHT::QAB(B)
      • R(f);N_GUARD,N_SPINB(g)::S(K),XP(h)
      • B(g);P_PINS(J),S_CUTR(f)::S(K)
      • B(l);OGATE::R(I)+P(F),XB(l)
      • S(d);SBLOCK::QAB(B)
      • S(d);N_GUARD,N_SPINB(g),SBLOCK::QAB(B),XP(c)
      • S(k);N_SPINB(g),P_PINS(K),SBLOCK,S_CUTR(f)::S(J)
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