MESON Chess Problem Database

Problem Display
PID: 83664 (qb2r3/P4R2/PP4p1/KN3R1p/2pPk1pQ/4N3/2n1P1p1/6B1 w - - 0 1)

Ellerman, Arnoldo

1st Prize, Magasinet, 1954

qb2r3/P4R2/PP4p1/KN3R1p/2pPk1pQ/4N3/2n1P1p1/6B1

#2

12 + 10

81 Chess 1954
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Re5
      • 2.Rf4#
    • 1...Bf4
      • 2.Rxf4#
    • 1...Bxa7
      • 2.Rf4#
    • 1...Sxd4
      • 2.Sc3#
  • Tries
    • 1.Sd1?
      • threat
        • 2.Sdc3#
        • 2.Sbc3#
      • 1...Re5
        • 2.Sc3#
      • 1...Qd5
        • 2.Sc3#
      • 1...Se3
        • 2.Sf2#
        • 2.Sdc3#
      • 1...c3
        • 2.Sdxc3#
        • 2.Sbxc3#
      • 1...gxf5!
    • 1.Sd5?
      • threat
        • 2.Sbc3#
        • 2.Sdc3#
      • 1...gxf5
        • 2.Sbc3#
      • 1...Se3
        • 2.Sdc3#
      • 1...c3
        • 2.Sbxc3#
        • 2.Sdxc3#
      • 1...Qxd5!
    • 1.Rd5?
      • threat
        • 2.Sc3#
      • 1...c3
        • 2.Sxc3#
      • 1...Qxd5!
    • 1.Qf2?
      • threat
        • 2.Qxg2#
      • 1...Sxe3
        • 2.Qxe3#
      • 1...Sxd4
        • 2.Sc3#
      • 1...gxf5
        • 2.Qxf5#
      • 1...Se1!
    • 1.Qe7+?
      • 1...Be5
        • 2.Rf4#
        • 2.Rxe5#
      • 1...Rxe7!
    • 1.Qxg4+?
      • 1...Bf4
        • 2.Rxf4#
        • 2.Qf3#
        • 2.Qxg2#
        • 2.Qxf4#
      • 1...hxg4!
  • Keys
    • 1.Sxg4!
      • threat
        • 2.Sc3#
      • 1...gxf5
        • 2.Sf6#
      • 1...Re5
        • 2.Se3#
      • 1...Qd5
        • 2.Se5#
      • 1...Se3
        • 2.Sf2#
      • 1...c3
        • 2.Sxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • R(j);P_PINS(G),S_CUTB(i)::R1(H)
    • B(i);N_GUARD,N_SPINP(e)::R1(H),XB(i)
    • B(i);N_GUARD,XP(K)::R1(H)
    • S(a);SBLOCK,XP(D)::S(G)
  • Tries
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(j);P_PINS(G)::S(C)
        • Q(h);P_PINS(G)::S(C)
      • Refutation
        • P(g);XR(H)
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(g);XR(H)::S(G)
        • S(a);::S(C)
      • Refutation
        • Q(h);P_PINS(G),XS(C)
    • Try
      • R(H);
      • Threat
        • S(G)
      • Vars
        • P(c);::S(G),XP(c)
      • Refutation
        • Q(h);P_PINS(G),XR(H)
    • Try
      • Q(E);N_PINP(e)
      • Threat
        • QAB(E),XP(b)
      • Vars
        • S(a);OGATE,XS(C)::QAR1(E),XS(a)
        • S(a);SBLOCK,XP(D)::S(G)
        • P(g);OGATE,XR(H)::QAB1(E),XP(g)
      • Refutation
        • S(a);
    • Try
      • Q(E);CHECK,N_PINP(e)
      • Refutation
        • R(j);XQ(E)
    • Try
      • Q(E);CHECK,XP(e)
      • Refutation
        • P(f);XQ(E)
  • Actual
    • S(C);XP(e)
    • Threat
      • S(G)
    • Vars
      • P(g);SBLOCK,XR(H)::QAR(E)+S(C),DCHECK
      • R(j);P_PINS(G),S_CUTB(i)::QAR(E)+S(C)
      • Q(h);P_PINS(G),SBLOCK::QAR(E)+S(C)
      • S(a);SBLOCK::QAR(E)+S(C),DCHECK
      • P(c);::S(G),XP(c)
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