MESON Chess Problem Database

Problem Display
PID: 21813 (5Br1/K4B2/R2pNp2/1PNkbq1R/2p4r/4pP2/7p/7Q w - - 0 1)

Ellerman, Arnoldo

1st Prize, Good Companions (January), 1921

5Br1/K4B2/R2pNp2/1PNkbq1R/2p4r/4pP2/7p/7Q

#2

10 + 10

3132 The Good Companion Two-Mover 1922
3391 Het Half Pin Thema 1924
3147 Chess Problems: Introduction to an Art 1963
3098 FIDE Album (1914-1944) (I) 1971
133 The Problemist Supplement 2003
56 The Problemist 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.Rxd6#
    • 1...Qc2
      • 2.Rxd6#
    • 1...Qd3
      • 2.Rxd6#
    • 1...Qh3
      • 2.Rxd6#
    • 1...Qe4
      • 2.Rxd6#
    • 1...Qg4
      • 2.Rxd6#
      • 2.fxg4#
    • 1...Qg6
      • 2.Rxd6#
    • 1...Qh7
      • 2.Rxd6#
    • 1...Qxf3
      • 2.Rxd6#
    • 1...Qf4
      • 2.Rxd6#
    • 1...Bg3
      • 2.f4#
  • Tries
    • 1.Rxf5?
      • threat
        • 2.Rxd6#
      • 1...Rxf8
        • 2.f4#
      • 1...dxc5
        • 2.Rd6#
      • 1...c3!
    • 1.Qd1+?
      • 1...Qd3
        • 2.Rxd6#
      • 1...Bd4
        • 2.Rxf5#
      • 1...Rd4!
    • 1.f4+?
      • 1...Qe4
        • 2.Rxd6#
        • 2.Qxe4#
      • 1...Rg2!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Sb6#
      • 1...Bd4+
        • 2.Sec5#
      • 1...Qxe6
        • 2.Rxd6#
      • 1...Qxf3
        • 2.Sxf6#
      • 1...Ba1
        • 2.Rxd6#
      • 1...Bb2
        • 2.Rxd6#
      • 1...Bc3
        • 2.Rxd6#
      • 1...Bg3
        • 2.f4#
      • 1...Bf4
        • 2.Qd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 8
  • Sets
    • Q(g);P_SPINB(f)::R1(F),XP(h)
    • Q(g);P_PINB(I),P_SPINB(f)::R1(F),XP(h)
    • Q(g);P_SPINB(f),P_SPINQ(g),XP(B)::R1(F),XP(h)
    • B(f);P_SPINQ(g),S_CUTR(j)::QAB(A)+P(B)
  • Tries
    • Try
      • R(E);P_PINB(f),XQ(g)
      • Threat
        • R1(F),XP(h)
      • Vars
        • R(j);N_GUARD,XB(J)::QAB(A)+P(B)
        • P(h);XS(D)::R1(F)
      • Refutation
        • P(c);
    • Try
      • Q(A);CHECK
      • Vars
        • Q(g);P_SPINB(f),P_SPINQ(g)::R1(F),XP(h)
        • B(f);P_PINS(D),P_SPINB(f),P_SPINQ(g),S_CUTR(d)::R(E),XQ(g)
      • Refutation
        • R(d);P_SPINR(d)
    • Try
      • P(B);CHECK
      • Refutation
        • R(j);P_SPINR(j)
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • B(f);CHECK,P_SPINQ(g),SBLOCK::B(I)+S(G)
      • Q(g);P_SPINB(f),P_SPINQ(g),XS(G)::R1(F),XP(h)
      • Q(g);N_GUARD,P_SPINB(f),P_SPINQ(g),XP(B)::S(D),XP(i)
      • B(f);N_GUARD,P_SPINQ(g)::R1(F),XP(h)
      • B(f);P_SPINQ(g),S_CUTR(j)::QAB(A)+P(B)
      • B(f);N_GUARD,P_SPINQ(g),S_CUTR(d)::QAR(A)
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