MESON Chess Problem Database

Problem Display
PID: 179908 (8/ppK4B/P3p3/Q3N3/P1NkP3/2R4p/3P3q/2r1n3 w - - 0 1)

Gross, Erwin

Die Schwalbe, 1962

8/ppK4B/P3p3/Q3N3/P1NkP3/2R4p/3P3q/2r1n3

#2

10 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe5+
      • 2.Qxe5#
    • 1...Rxc3
      • 2.dxc3#
    • 1...Sc2
      • 2.Rd3#
    • 1...Sg2
      • 2.Rd3#
    • 1...Sd3
      • 2.Rxd3#
    • 1...Sf3
      • 2.Rd3#
  • Tries
    • 1.Kxb7?
      • threat
        • 2.Sc6#
      • 1...Qxe5
        • 2.Qxe5#
      • 1...Rxc3
        • 2.dxc3#
      • 1...Rb1+!
    • 1.Qb4?
      • threat
        • 2.Qd6#
      • 1...Qxe5+
        • 2.Sd6#
      • 1...Qxd2!
    • 1.axb7?
      • threat
        • 2.Qxa7#
      • 1...Qxe5+
        • 2.Qxe5#
      • 1...Qxd2
        • 2.Sc6#
      • 1...Sd3
        • 2.Rxd3#
      • 1...a6
        • 2.Qb6#
      • 1...Rb1!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Qc5#
      • 1...Rxc3+
        • 2.Qxc3#
      • 1...Qxe5
        • 2.Qb4#
      • 1...b5
        • 2.Sc6#
      • 1...Sd3
        • 2.Sf3#
      • 1...b6
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(c);CHECK,OGATE,XS(G)::QAB1(F),XQ(c)
    • R(a);N_PINS(G),OGATE,P_PINS(D),XR(B)::P(A),XR(a)
    • S(b);N_GUARD::R1(B)
    • S(b);N_GUARD::R1(B),XS(b)
  • Tries
    • Try
      • K(I);N_SPINS(G),P-FLIGHT,XP(h)
      • Threat
        • S(G)
      • Vars
        • Q(c);OGATE,XS(G)::QAB1(F),XQ(c)
        • R(a);OGATE,XR(B)::P(A),XR(a)
      • Refutation
        • R(a);CHECK
    • Try
      • Q(F);
      • Threat
        • QAR2(F)
      • Vars
        • Q(c);CHECK,SBLOCK,XS(G)::QAR(F)+S(D)
      • Refutation
        • Q(c);N_PINS(G),XP(A)
    • Try
      • P(H);XP(h)
      • Threat
        • QAB(F),XP(g)
      • Vars
        • Q(c);CHECK,OGATE,XS(G)::QAB1(F),XQ(c)
        • Q(c);N_PINS(G),XP(A)::S(G)
        • S(b);N_GUARD::R1(B),XS(b)
        • P(g);N_GUARD::QAB(F)
      • Refutation
        • R(a);
  • Actual
    • S(D);N_SPINS(G),P_SPINR(B)
    • Threat
      • QAB1(F)
    • Vars
      • R(a);CHECK,OGATE,XR(B)::QAB1(F),XR(a)
      • Q(c);P_PINS(D),SBLOCK,XS(G)::QAR2(F)
      • P(h);N_GUARD::S(G)
      • S(b);N_GUARD::S(G)
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